Rollback NTFS only change. Allow ReFS.
Onedrive client stopped supporting other filesystems (incl ReFS) except NTFS and HFS+ (mac client). This was done without notifying end users.
An UserVoice was already created for this (Allow OneDrive folder to be on a Storage Space (ReFS File System)), but a Microsoft employee simply rejected it without justifying the sudden change.
@Douglas Pearce: Dont reject this uservoice without giving justification. The link you provided in the previous uservoice doesnt explain why Onedrive for Mac works in HFS+ or that Onedrive for business (but same client) can still be synced to ReFS.
David Mackey commented
I know this is pretty old, but I'd still like to understand why ReFS support was removed? Is it that OneDrive now provides the same functionality? Or are we simply losing functionality?
Onderive & ReFS teams should definitely make OneDrive to work on ReFS.
I upgarded from Win10 Home to Win10 Pro for Workstation (USD 250) just because of ReFS. And you can imagine my frustration when I found out that OneDrive does not work. This limitation renders ReFS pretty much useless on WorkStations and limits it to servers only. My understanding that this limitation is due to Onedrive's "Files on-demand" feature relying on NTFS features not implemented in ReFS. I have terabytes of RAID space on my PC and I do not care about "Files on Demand" feature. ReFS is far more important feature to me. Luckily MSFT Store refunded my purchase. This is a high-end feature and you can never expect this feature to get much votes. But Win10's future is in the high-end (in case Onedrive team cares about it at all...).