These seem to take up loads of space. Can I safely delete them or will it cause problems?
macOS Office 365 – Can FSD Files Be Deleted
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Best Answer
Those files are cache files for syncing changes between OneDrive for Business and/or Sharepoint shares.
Is it safe to delete? Yes.
However, they'll just be recreated as you sync back and forth your OneDrive folder(s).
However, there's been a fix for this for some time now - make sure you update your OneDrive client and that you enable Files-On-Demand