How to Backup Standard LXC containers?

May 18, 2019
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Trying to backup standard LXC containers (using the dir driver).
Code:
proxmox-backup-client backup /var/snap/lxd/common/lxd/storage-pools/default/containers/my-ct --repository $PBS_REPOSITORY
as expected, doesn't work. there needs to be specified a .pxar or .img block device. which other options does it take?

I take it is not possible OR is there a workaround?!