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Great! Your are welcome.

I forgot comment one thing ... Instead of use a physical device for your firewall, you can create it as a virtual machine and connect it to all your networks. For our customers we usually build the virtualization infrastructure as a Proxmox/Ceph cluster of at least three nodes and then create a...

Yes, you can put your Proxmox host behind your firewall, but you should segment your network for improve security. For example, behind your firewalls you can have several networks: CONTROL: You can connect to this LAN your Proxmox server, the IPMI interface (if your host has one), switches...

Look at this another post: https://forum.proxmox.com/threads/disk-full-unable-to-run-garbage-collection.81800/ I hope it helps you.

The error is a timeout in qeumu-agent communication. Have you tried to increase the timeout for the qemu-agent communication?

What kind of virtual disk image are you using for your virtual machine? If it is qcow2, you can try this for check the virtual disk integrity.

You can run a Memtest for check your RAM: https://linuxhint.com/run_memtest_ubuntu/

Can you see something in the syslog of the virtual machine?

Ok, sorry me :-)

Remove the option `--quiet 1` this way the command will output more data. Regarding the backup storage, do you have nought free space?

In such e-mail you should have the command issued for the backup with vzdump. Which is it? Can you run this command on your Proxmox virtual environment in order to see if it gives more information regarding the problem?

Is this the output of the vzdump command? Which is the vzdump command that are you using for make the backup?

I understand and agree with you. Maybe you can do both things: Database backups over a directory. Backup of the VM with PBS (make sure that this is launched after the database backup). This way, you will have in the PBS an historic of consistent database backups that you can restore if you...

What about disabling Qemu Guest Agent?

Great work! Thank you very much for sharing it.

It is advisable that you upgrade your Proxmox and Qemu Guest Agent to the latest version. Is it possible?

In you previous post you said that no failures in your latest backup. Have you done more backups? Do you still have failures in the latest backups?

Do you have Proxmox 2.x installation? The last Proxmox version is 7.0-2. You really should think about upgrading it.

Yes, PBS works at block level independently of the block contents. PVE write to disk when the VM OS requests this write, then it dependes on the VM I/O activity.

Perhaps the action explained in the next post can help solve your problem: https://forum.proxmox.com/threads/pvestatd-often-reports-storage-offline-with-cifs.47414/