[PVE-User] Backup Beta - restore failing

[Dietmar Maurer]

> > proxmox-backup-client restore '--crypt-mode=none' vm/311/2020-07-11T00:57:52Z index.json /var/tmp/vzdumptmp121335/index.json --repository proxmox at pbs@192.168.5.49:backupbeta
> 
> The datastore name in 'test', so please try "proxmox at pbs@192.168.5.49:test" instead.

Please note that 'proxmox-backup-client' uses backup server datastore 
names, instead of pve storage names. I guess this can be confusing ...