Backup Suddenly Failing

[JSylvia007]

Howdy all! I have a backup configuration that's been working fine for years. It's for some non-critical VMs, but recently, one of the VMs mysteriously started failing.

Since it's not critical, I just sad 'screw it', and deleted the backup and recreated the configuration. This completely new backup is still failing, and only on that one problem VM.

Error: stream has ended with not enough data (actual: 397, expected: 2097152)

Error: ENOENT: no such file or directory, stat '/opt/xo/mounts/9f2e49f9-4e87-444a-aa68-4cbf73f28e6d/xo-vm-backups/afe4bee2-745d-da4a-0016-c74751856556/vdis/7fc5396a-5383-4dab-91fe-6758eb8b7474/530abab7-9ea9-43d4-be6e-acb3fbf67065/20260323T124158Z.alias.vhd'

I re-ran it, and got some more info, but that could just be that the initial backup failed in this new backup configuration...

ADMIN-VM02 (xcpng01) 
Clean VM directory 
VHD check error
path
"/xo-vm-backups/afe4bee2-745d-da4a-0016-c74751856556/vdis/e57785aa-f99d-4f67-b951-5c6ac5fef518/530abab7-9ea9-43d4-be6e-acb3fbf67065/20260313T020007Z.alias.vhd"
error
{"generatedMessage":false,"code":"ERR_ASSERTION","actual":false,"expected":true,"operator":"==","diff":"simple"}

orphan merge state
mergeStatePath
"/xo-vm-backups/afe4bee2-745d-da4a-0016-c74751856556/vdis/e57785aa-f99d-4f67-b951-5c6ac5fef518/530abab7-9ea9-43d4-be6e-acb3fbf67065/.20260313T020007Z.alias.vhd.merge.json"
missingVhdPath
"/xo-vm-backups/afe4bee2-745d-da4a-0016-c74751856556/vdis/e57785aa-f99d-4f67-b951-5c6ac5fef518/530abab7-9ea9-43d4-be6e-acb3fbf67065/20260313T020007Z.alias.vhd"

missing target of alias
alias
"/xo-vm-backups/afe4bee2-745d-da4a-0016-c74751856556/vdis/e57785aa-f99d-4f67-b951-5c6ac5fef518/530abab7-9ea9-43d4-be6e-acb3fbf67065/20260313T020007Z.alias.vhd"

Start: 2026-03-23 17:26
End: 2026-03-23 17:26

Any idea what's going on here?