Are you trying a file-level-restore for a Windows VM? If so, make sure you have the "ntfs-3g" package installed on your VM running XO.
R
Posts
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RE: XO Backup - question on file level restoreposted in Xen Orchestra
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RE: File Level Restore results in "Error while scanning disk"posted in Xen Orchestra
You should probably be able to fix this issue by installing the ntfs-3g package.
As you mentioned you're running it on a Synology, you can do that in DSM by opening Docker -> Container -> Select your container -> Details -> Terminal and enter the below in the console.
apk updateapk add ntfs-3gLet us know if it helped.