Windows Server 2016 backup with ReFS

[MajorMaccas]

I've got my home server running Windows Server 2016, and have the built in Windows Server Backup set for a daily backup from one drive to another, pretty basic stuff.

Both drives are formatted in ReFS, which should use archive flags so only files that are changed get backed up. But this is not happening, it is doing a full drive backup, which takes longer than 24 hours, hence every other backup operation is failing because the previous day's hasn't completed by the time today's is due to start.

I've set a temporary workaround of doing it weekly on a Tuesday, so it will be backing up as we speak right now, but I'd prefer to get it working properly and only backing up what's changed.

Does anyone know how to get it to work as it should?

Thanks.

 

[bledd]

Is it data folders or a system drive that you're backing up?

System..
Veeam Endpoint

Data...

Robocopy, first tun will copy everything, all subsequent runs will only copy new and updated files.

This copies all files/folders
robocopy /e "C:\source folder" "D:\backup\destination folder"

This copies all files/folders and gets rid of deleted files.
robocopy /mir "C:\source folder" "D:\backup\destination folder"