Does the command 'lsblk' show the the swap... one of the drives (sdb or sdd) should contain the swap partition and will look similar to this with "[SWAP}" denoting the swap partition.
This usually means the root partition is full or Docker is not using Zfs or the zpool is full. First ssh to the antsle's command line? ssh root@antsle_name.local or ssh root@x.x.x.x or if on Windows use Putty ...
If a backup fails with the following error: Snapshot '_antsle_backup' exists, probably from a backup in progress. If this is not the case, please delete it and try again. From the antsle's command ...