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Man kann aber schauen ob die "agent" property in der vm config gesetzt ist.

Please test again with the current version. It should work without problems.

This is not true. Proxmox backup use a special qemu feature to make snapshots (copy before write), and this is storage independent, i.e. it also works on NFS/raw.

Sorry, but that sounds strange. What problem do you have exactly?

Simply restore using a new VMID (from the backup datastore panel).

Instead, you need to find out the real problem. Why does the VM crash? Any hint in the backup log or syslog?

Also, do you run the latest version of PBS?

All Proxmox VE related services depend on pve-cluster, so there is no single pve service, VM or Container running unless that is up.

SHA is always used, and is not related to encryption (encryption is done using AES).

I don't think that will change anything...

Its not only compression. See the output of "proxmox-backup-client benchmark". For example, SHA256 checksum computation speed is 13% compared to the reference system.

The CPU (Intel Xeon E5-2650L V4) seems to be very slow.

Most likely you have an unstable storage system. What is the output of # pvesm status

3-2-1 backup rule: You should have three total copies, use two different media (disk and tape, usually), and keep one copy offsite (tape). You will be always able to restore the offsite tape.

Again, pmxcfs is not a general purpose file system, and we have bumped the limits where sensible in the past. I suggest that you use a real cluster file system if you run into limits, for example cephfs, ... Plus, we're always interested in improving things. As soon as I have an idea to do...

pmxcfs is not a filesystem used to store arbitrary data. Instead, It is used to store PVE configuration into a transactional database. Each write is atomic and synced to the disk! So please use other filesystems if you want to store large files. pmxcfs is not meant for that, and was never...

yes

Sure, this is a basic feature for any hypervisor: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_migration

Ceph is far superior to these legacy storage technologies. So in short, we do not plan to implement that.

That is explained in the developer documentation: See: http://pve.proxmox.com/wiki/Developer_Documentation