Configure PBS VM for `helios`

[morey-tech]

Create a Proxmox Backup Server (PBS) VM on helios to manage backups for the VM/CTs. Guests will use storage-nvme and PBS will use a large disk on storage-ssd to hold the backups.

Later the backups will be copied to a remote machine (later site) with the work from #27.

[morey-tech]

Create lv with the 500GB disk and mount it:

root@pbs:~# pvcreate /dev/sdb
root@pbs:~# pvdisplay
root@pbs:~# vgcreate backups-01_vg /dev/sdb
root@pbs:~# lvcreate -l 100%FREE -n backups-01_lv backups-01_vg
root@pbs:~# mkfs.ext4 /dev/backups-01_vg/backups-01_lv
root@pbs:~# mkdir -p /datastores/backups-01
root@pbs:~# mount /dev/backups-01_vg/backups-01_lv /datastores/backups-01
root@pbs:~# export UUID=$(blkid -s UUID -o value /dev/backups-01_vg/backups-01_lv)
root@pbs:~# echo "UUID=$UUID /datastores/backups-01 ext4 defaults 0 2" | tee -a /etc/fstab
root@pbs:~# lsblk
NAME                            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sdb                               8:16   0  500G  0 disk 
└─backups--01_vg-backups--01_lv 252:2    0  500G  0 lvm  /datastores/backups-01