Error Knem

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agmunari wrote:

thanks for the help, the nas is a Readynas 516 with 6 x 4tb disks in RAID 10

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Thanks.

I suggest first downloading the full log zip file, and see if you can find any disk-related or BTRFS related errors at around the time the NAS crashed.  You can look in system.log, kernel.log, and systemd-journal.log.  Looking at the backup log might also be helpful.

I'd also make sure that the volume is still mounted normally - if the NAS finds issues with the file system, it can remount the volume as read-only to help protect the data. If the volume is still mounted normally, and if you haven't tried simply rebooting the NAS and running the backup again, then I suggest trying that.

Also, check for any warnings that the root (OS partition) is filling. 

FWIW, although we should reclaim the space freed up by your file deletions, I think completing the backup is the first priority.  If you have between 20-30% free space, then you do have enough.  On my own NAS, I plan for expansion when the free space drops to about 20% (making sure the systems always have at least 15% free space).