{"id":20402,"date":"2026-04-27T07:42:33","date_gmt":"2026-04-27T07:42:33","guid":{"rendered":"https:\/\/www.sandbox.backupassist.com\/blog\/?p=20402"},"modified":"2026-04-27T07:45:47","modified_gmt":"2026-04-27T07:45:47","slug":"backupassist-classic-onedrive-folders-files-on-demand","status":"publish","type":"post","link":"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand","title":{"rendered":"Why BackupAssist Classic doesn&#8217;t show your OneDrive sync folders \u2014 and how to properly back up mixed on-premise and cloud environments"},"content":{"rendered":"\n<p>Recently, we have been getting many questions about using the OneDrive sync app to pull back cloud-based data so it can be incorporated into on-premise backups.<\/p>\n\n\n\n<p>In fact, many people have gone ahead, installed the app, and synced back their files, only to find that BackupAssist Classic won&#8217;t show these folders in the backup selection screen. No error. No warning. They&#8217;re just missing.<\/p>\n\n\n\n<p>The short version is this: using the sync app for backup purposes is a bad idea. We will explain why by going into the technology. But if you need a quick summary, these are the three things you need to know.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>BackupAssist Classic can only back up data that is actually present on a machine or network share.<\/strong><\/li>\n\n\n\n<li><strong>Modern sync apps like OneDrive use a feature called Files On-Demand.<\/strong> What exists locally is a placeholder pointing towards the cloud copy \u2014 the data still sits in the cloud. A backup will only capture the pointer, not the data itself. Even forcing the download by marking files as always available isn&#8217;t always guaranteed, as we explain below.<\/li>\n\n\n\n<li><strong>The real solution is to use BackupAssist 365<\/strong> to pull your cloud data down to your on-premise machine and incorporate it into your backups. <\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">How modern OneDrive actually stores files<\/h2>\n\n\n\n<p>When you use OneDrive with its default settings, you&#8217;re using a feature called Files On-Demand \u2014 implemented via the Windows Cloud Files API (CFAPI). Instead of downloading your entire OneDrive library to local storage, Windows creates placeholder files that look real but aren&#8217;t fully stored on your machine.<\/p>\n\n\n\n<p>It&#8217;s worth pausing on what OneDrive actually is. It&#8217;s a sync and collaboration tool \u2014 not a backup application. It was designed to make files accessible across devices and to enable sharing, not to create independent, recoverable copies of your data. The Files On-Demand feature reflects that design intent: keep the appearance of everything being available locally, while actually storing the data in the cloud and only downloading it when needed.<\/p>\n\n\n\n<p>Each file in your OneDrive sync folder has one of three states:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Online-only<\/strong> \u2014 the file exists in the cloud; only a placeholder is on your local drive<\/li>\n\n\n\n<li><strong>Locally available (cached)<\/strong>\u00a0\u2014 the file has been accessed recently and is temporarily cached on disk<\/li>\n\n\n\n<li><strong>Always available (fully pinned offline)<\/strong>\u00a0\u2014 the file has been explicitly marked to always remain on the local drive<\/li>\n<\/ul>\n\n\n\n<p>This is by design. Files On-Demand is a sensible feature \u2014 it lets you see your entire OneDrive library without using local disk space for files you rarely need. The problem arises when backup software tries to treat these placeholders as real files.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">What a reparse point is \u2014 and why it matters<\/h2>\n\n\n\n<p>The placeholder files OneDrive creates are not ordinary files. They are implemented as <strong>NTFS reparse points<\/strong> \u2014 a special filesystem object with a tag that tells Windows:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;Don&#8217;t treat this like a normal file \u2014 hand it off to a filter driver.&#8221;<\/p>\n<\/blockquote>\n\n\n\n<p>For OneDrive specifically, that tag is `IO_REPARSE_TAG_CLOUD`. When Windows sees a file with this tag, it knows to route any read request through the OneDrive filter driver, which then decides whether to serve the file from local cache or download it on the fly from the cloud.<\/p>\n\n\n\n<p>BackupAssist Classic does not back up NTFS reparse points at a file level. This isn&#8217;t an oversight \u2014 reparse points require specific handling to interpret correctly, and without it, attempting to back one up produces either nothing useful or a meaningless stub.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">What&#8217;s actually stored locally<\/h2>\n\n\n\n<p>When a file is online-only, here&#8217;s what exists on your local disk:<\/p>\n\n\n\n<p><strong>Stored locally:<\/strong>&nbsp;&#8211; File metadata (name, size, timestamps) &#8211; A small stub \u2014 often 0 bytes or minimal in size &#8211; A reparse tag and cloud file identity reference<\/p>\n\n\n\n<p><strong>Not stored locally:<\/strong>&nbsp;&#8211; The actual file contents (until the file is accessed and downloaded)<\/p>\n\n\n\n<p>This creates a specific and important problem for backup.&nbsp;<strong>BackupAssist Classic can only back up data that is actually present on the machine<\/strong>&nbsp;\u2014 and for an online-only file, the data isn&#8217;t present. Windows Explorer reports the file as existing, with its correct name, size, and modified date. But that reported size is not backed by actual data on disk. A file that Windows reports as 2 GB may physically occupy just a few kilobytes of local storage \u2014 or less. The rest is in the cloud, retrieved on demand when you open the file.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Why &#8220;the file looks like it&#8217;s there&#8221; is misleading<\/h2>\n\n\n\n<p>This is the core of the problem.<\/p>\n\n\n\n<p>Windows Explorer shows you: &#8211; The file name &#8211; The reported file size (from cloud metadata) &#8211; The modified date<\/p>\n\n\n\n<p>For an online-only file, none of that means the data is on your disk. The size is a logical value pulled from the cloud \u2014 it tells you how large the file is in OneDrive, not how much of it is actually stored locally. A folder that appears to contain 50 GB of files may have almost nothing on local storage at all.<\/p>\n\n\n\n<p>If backup software naively reads those placeholders without understanding what they are, it captures the stub and the metadata \u2014 not the file. You&#8217;d have a backup that appears complete but contains nothing recoverable.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Why BackupAssist Classic doesn&#8217;t show these folders<\/h2>\n\n\n\n<p>Since BackupAssist Classic does not back up NTFS reparse points, the only way to capture OneDrive files through Classic would be to force-download every file to local storage first \u2014 fully pinning the entire library offline. That may work for some environments, but it reintroduces exactly the storage overhead that Files On-Demand is designed to avoid, and it&#8217;s not reliable at scale (as we&#8217;ll explain below).<\/p>\n\n\n\n<p>Rather than show these sync folders in the file selection screen and risk giving you the impression that your OneDrive data is protected when it isn&#8217;t, we exclude them. An empty selection is more honest than a misleading one.<\/p>\n\n\n\n<p>This is not a gap we left by accident. It reflects a deliberate decision: if we can&#8217;t back something up reliably, we won&#8217;t claim that we can.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">Why the sync app is not a reliable backup path<\/h2>\n\n\n\n<p>We do not recommend using a sync app for backup purposes. If sync meant mirror, then in general it would be okay. But the problem is sync apps do unexpected things under the hood.<\/p>\n\n\n\n<p>It is worth understanding the history here. The previous OneDrive for Business sync client \u2014 Groove.exe, which Microsoft retired in 2021 \u2014 had a hard limit of 20,000 items across all synced libraries. Hit that ceiling, and sync simply stopped. Because servers generally run unattended, this means that if you were relying on the sync folder for your backup, you could have an incomplete backup you did not even know about.<\/p>\n\n\n\n<p>The current OneDrive sync client does not specify what its hard limits are. But equally worrying is the fact that Windows&#8217; Storage Sense feature can silently dehydrate locally cached files when disk space runs low \u2014 meaning files that appeared to be fully local get converted back to online-only stubs without any notification.<\/p>\n\n\n\n<p>For backing up business data, this is simply unacceptable. It does not provide the level of predictability that a backup strategy requires. The backup may be incomplete, it happens silently, and the first time you find out is when you try to do a restore.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">The solution: BackupAssist 365<\/h2>\n\n\n\n<p>The goal of pulling down Microsoft 365 data and including it in the on-premise backups is sound. The problem is that the OneDrive sync folder is not the path to get there.<\/p>\n\n\n\n<p>The right solution is to bypass the local sync folder entirely and go directly to the source. Pull back the data so that it lives locally, and then decide how many additional replicas or backups are required based on the business requirements.<\/p>\n\n\n\n<p>BackupAssist 365 does exactly that. It connects to your Microsoft 365 tenant via Microsoft&#8217;s own APIs and downloads your data directly to your chosen local backup destination \u2014 no sync folder required, no dependency on what happens to be cached on a particular machine. The backup reflects what&#8217;s actually in the cloud, not the state of whichever device ran the backup job.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How it works<\/h3>\n\n\n\n<p>BackupAssist 365 is a separate product from Classic \u2014 its own installer, its own interface, its own licensing. If you&#8217;re running Classic for Windows Server and workstation backup, you run both products alongside each other. They address different problems and don&#8217;t overlap.<\/p>\n\n\n\n<p>Key things to understand about BackupAssist 365:<\/p>\n\n\n\n<p><strong>It covers mailboxes, SharePoint, and OneDrive.<\/strong>&nbsp;All three are downloaded to your local storage \u2014 mailboxes to PST files (a standard format recoverable without BackupAssist), and SharePoint and OneDrive to a plain folder structure that mirrors your cloud layout. You can browse the lot directly in Windows Explorer without any BackupAssist tool installed.<\/p>\n\n\n\n<p><strong>No special storage infrastructure required.<\/strong>&nbsp;The backup destination is a plain file system \u2014 no S3-compatible storage, no proprietary appliance, no vendor-managed cloud destination. If you have a local drive or a network share, you have everything you need. And because there&#8217;s no proprietary format to decode, you can access your files directly in Windows Explorer without BackupAssist installed.<\/p>\n\n\n\n<p><strong>Selective restore is included.<\/strong>&nbsp;A restore tool is available for both bulk and granular restores. You don&#8217;t need to restore everything to recover a single file or folder.<\/p>\n\n\n\n<p><strong>Microsoft&#8217;s retention policies are not a substitute for this.<\/strong>&nbsp;Microsoft&#8217;s built-in retention and recovery features have real limitations in duration and scope, and they don&#8217;t give you an independent copy of your data that you control. BackupAssist 365 gives you that copy, stored on your own infrastructure, accessible without Microsoft.<\/p>\n\n\n\n<p><strong>MSP visibility is included.<\/strong>&nbsp;If you&#8217;re managing multiple tenants, BackupAssist 365 can be monitored through the Managed Backup Console alongside your Classic installations \u2014 one place to see the backup status of both your on-premise and Microsoft 365 environments.<\/p>\n\n\n\n<p>For more information on BackupAssist 365, visit the\u00a0<a href=\"https:\/\/www.backupassist.com\/365\/overview\" target=\"_blank\" rel=\"noreferrer noopener\">product page<\/a><a href=\"https:\/\/www.backupassist.com\/365\/overview\">.<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As data shifts into Microsoft 365, on-premise backups stop covering everything they used to. The natural instinct is to use the OneDrive sync app to fill that gap \u2014 but this is often unreliable and problematic. We explain why, and how to properly extend your backup coverage to include Microsoft 365 data.<\/p>\n","protected":false},"author":9,"featured_media":20403,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[771],"tags":[708,805,810,807,809,808,806,249],"class_list":["post-20402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-backupassist-classic","tag-backupassist-365","tag-backupassist-classic","tag-cloud-files-api","tag-files-on-demand","tag-microsoft-365-backup","tag-ntfs-reparse-points","tag-onedrive-backup","tag-windows-backup"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why BackupAssist Classic doesn&#039;t show OneDrive sync folders (and the fix)<\/title>\n<meta name=\"description\" content=\"Want your on-premise backups to include Microsoft 365 data? The OneDrive sync folder isn&#039;t the answer. Learn why \u2014 and how BackupAssist 365 solves it properly.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why BackupAssist Classic doesn&#039;t show OneDrive sync folders (and the fix)\" \/>\n<meta property=\"og:description\" content=\"Want your on-premise backups to include Microsoft 365 data? The OneDrive sync folder isn&#039;t the answer. Learn why \u2014 and how BackupAssist 365 solves it properly.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\" \/>\n<meta property=\"og:site_name\" content=\"Cyber Resilience Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-27T07:42:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-27T07:45:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.sandbox.backupassist.com\/app\/uploads\/sites\/3\/2026\/04\/onedrive-files-on-demand-backupassist.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2048\" \/>\n\t<meta property=\"og:image:height\" content=\"1367\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mike Deaton\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mike Deaton\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\"},\"author\":{\"name\":\"Mike Deaton\",\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/#\/schema\/person\/7d2bcdc4f633600511d30f360d9343b8\"},\"headline\":\"Why BackupAssist Classic doesn&#8217;t show your OneDrive sync folders \u2014 and how to properly back up mixed on-premise and cloud environments\",\"datePublished\":\"2026-04-27T07:42:33+00:00\",\"dateModified\":\"2026-04-27T07:45:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\"},\"wordCount\":1639,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.sandbox.backupassist.com\/app\/uploads\/sites\/3\/2026\/04\/onedrive-files-on-demand-backupassist.jpeg\",\"keywords\":[\"backupassist 365\",\"BackupAssist Classic\",\"cloud files API\",\"Files On-Demand\",\"Microsoft 365 backup\",\"NTFS reparse points\",\"OneDrive backup\",\"windows backup\"],\"articleSection\":[\"BackupAssist Classic\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\",\"url\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand\",\"name\":\"Why BackupAssist Classic doesn't show OneDrive sync folders (and the fix)\",\"isPartOf\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.sandbox.backupassist.com\/blog\/backupassist-classic-onedrive-folders-files-on-demand#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.sandbox.backupassist.com\/app\/uploads\/sites\/3\/2026\/04\/onedrive-files-on-demand-backupassist.jpeg\",\"datePublished\":\"2026-04-27T07:42:33+00:00\",\"dateModified\":\"2026-04-27T07:45:47+00:00\",\"description\":\"Want your on-premise backups to include Microsoft 365 data? 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He began his technical career serving in the United States Marine Corps, working in Communications and Electronics with a focus on encrypted voice and data transmission systems\u2014an experience that established his disciplined, systems-level approach to technology. Following his military service, Mike spent five years as an Information Systems Technician and Network Administrator for a Japanese automotive manufacturing company. In that role, he was responsible for maintaining production-critical systems, where downtime wasn\u2019t theoretical\u2014it directly impacted operations. Working in that environment gave him firsthand experience with the pressure, urgency, and complexity that come with system failures and disaster scenarios. Since 2008, Mike has been part of BackupAssist, where he has served as both a technical support specialist and head of the global support team. Over that time, he has worked through thousands of support cases, ranging from straightforward backup configurations to complex recovery situations requiring deep analysis of Windows internals. Having been on both sides\u2014as the administrator responsible for systems and the expert helping recover them\u2014he brings a practical, experience-driven perspective to every case. Mike\u2019s writing reflects that background. He focuses on the realities of Windows backup and recovery, including the edge cases, limitations, and failure points that are often overlooked in official documentation. His goal is to help system administrators understand not just how systems are supposed to work, but what actually happens when they fail\u2014and how to be prepared when it matters most. His articles are written for IT professionals who want the full picture\u2014beyond the marketing layer\u2014so they can make informed decisions and confidently handle critical situations. 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