Is Proxmox LXC backup broken and kills data on mp0?

Hi,

I have an container and did a backup using proxmox GUI. It has an mp0 configured like the rootfs. I'm surprised of the behavior and I don't like surprises in backups.

First, although configuration for rootfs and mp0 in GUI look "the same" (especially neither mentioning backup=0), only rootfs is backed up. Apparently, for rootfs backup=1 is default, but for mp0 backup=0 is default and I think this is wrong and should be changed. If they had the same defaults, the backup would have been...

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