An additional observation: The guest VM is configured to run from a LVM partition, which I thought will not support snapshots. Nevertheless the backup can be configured for snapshot mode. How would this work? Indeed the VM is only stopped for a short time and is running again when the backup...
I am curious what you are able to see from the output of findmnt. The largest backup that worked was about 89GB.
After an upgrade on friday, which involved a new zstd package I ran the backup again over the weekend. This time with a different error message which I unfortunately cannot share...
We run proxmox 6.3-3. A scheduled backup fails for a single VM with:
...
NFO: 59% (2.4 TiB of 4.1 TiB) in 5h 37m 20s, read: 124.1 MiB/s, write: 122.1 MiB/s
zstd: error 25 : Write error : File too large (cannot write compressed block)
ERROR: VM 102 qmp command 'query-backup' failed - got...
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