ERROR: VM 100 qmp command 'guest-fsfreeze-thaw' failed - got timeout

You first need to detach the disk, then re assign it using the SATA controller instead.
I have the same problem. But unmounting the drive also means that I have to completely rebuild the machine, right? With a new Sata drive, the machine can no longer boot and restore does not work, because then the IDE drive is back. Correct me if i m wrong
 
I don't know if this can help, but in my environment this problem appeared after changing mysql-8 to mariadb-10.9.3. (with mysql-8 backup works fine)

I have ~18 VMs in 3 node cluster based on PVE 7.2-7.
On all VMs i use Debian 11 and only on 2 nodes with mariadb error occurs. (most of the VM have scheduled everyday backup). Disk works as zfs-file. (converted from .raw which fail too)
Backup destination is NFS storage.

Now I test a workaround excluding qemu-guest-agent service. It seems to backup properly without it.
 
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I have the same issue, it looks like its a Mariadb version issue, when I was running Mariadb 10.3, I was able to do snapshot backups, now on Mariadb 10.5 if I do that I have to shut off the LXC and turn it back to to make it work again.

Now I have a special backup job to "stop" the lxc and then backup them and don't have any issues but feels like this is a Proxmox issue combined with Mariadb 10.5 version +
 
I have the same issue, it looks like its a Mariadb version issue, when I was running Mariadb 10.3, I was able to do snapshot backups, now on Mariadb 10.5 if I do that I have to shut off the LXC and turn it back to to make it work again.

Now I have a special backup job to "stop" the lxc and then backup them and don't have any issues but feels like this is a Proxmox issue combined with Mariadb 10.5 version +
I am currently having this backup issue and it's only affecting 1 of my VM's. It's my Windows 11 VM that doesn't have much installed other than a hand full of generic applications. I'm pretty sure the problem started after I did my most recent update to Proxmox - which I hadn't done in quite some time.
When you say it's a problem with Mariadb - I'm assuming this is the db package installed within Proxmox and not something installed on the affected VM right?
If so, how do I tell what version of Mariadb I have loaded on proxmox currently? And also why would it only affect one VM if it was an issue with a proxmox app. You'd think all VM's would have an issue with their backups. But for me, it's only the one Win11 VM.
 

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