My Jellyfin VM has been failing its nightly backups for some time now (maybe a week or so).

I’m currently backing up to a NAS that has plenty of available space and my other 10 VMs are backing up without issues (though they are a bit smaller than this one).

I am backing up with the ZSTD compression option and the Snapshot mode.

The error is as follows:

INFO: include disk 'scsi0' 'Proxbox-Local:vm-110-disk-0' 128G
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating vzdump archive '/mnt/pve/Proxbox-NAS/dump/vzdump-qemu-110-2025_01_04-03_29_45.vma.zst'
INFO: started backup task '4be73187-d25c-49cf-aed2-1217fba27f77'
INFO: resuming VM again
INFO:   0% (866.4 MiB of 128.0 GiB) in 3s, read: 288.8 MiB/s, write: 268.0 MiB/s
INFO:   1% (1.5 GiB of 128.0 GiB) in 6s, read: 221.1 MiB/s, write: 216.0 MiB/s
INFO:   2% (2.6 GiB of 128.0 GiB) in 15s, read: 130.5 MiB/s, write: 126.4 MiB/s
INFO:   3% (3.9 GiB of 128.0 GiB) in 25s, read: 128.9 MiB/s, write: 127.5 MiB/s
ERROR: job failed with err -5 - Input/output error
INFO: aborting backup job
INFO: resuming VM again
ERROR: Backup of VM 110 failed - job failed with err -5 - Input/output error
INFO: Failed at 2025-01-04 03:30:17

Anyone experienced this or have any suggestions as to resolving it?

Update: After rebooting the Proxmox node (not just the VM) my backups are now working again. Thanks all for the input!