A user who says they have a few documents in OneDrive may have 20 GB of Desktop and Documents content that Known Folder Move has been syncing for years.

KFM redirects the Windows Desktop, Documents, and Pictures folders to sync to OneDrive for Business instead of local storage. Files that look local on the Desktop are actually in the OneDrive sync path, so a source OneDrive site often holds far more than its owner expects.

BitTitan OneDrive migration jobs move KFM content the same way they move manually placed files. It still changes three things:

• OneDrive size estimate. The content volume is larger than users report.
• Migration timeline. The extra volume lengthens the schedule.
• Post-cutover configuration. KFM has to be reconfigured in the destination tenant after the migration completes, so Desktop and Documents point to the new OneDrive site.

Have you assessed KFM in your source tenant and counted its content volume in your OneDrive migration scope and schedule?

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