proxmox6:/backup# vzdump 300 --compress --dumpdir /backup/
INFO: starting new backup job: vzdump 300 --compress --dumpdir /backup/
INFO: Starting Backup of VM 300 (openvz)
INFO: CTID 300 exist unmounted down
INFO: status = CTID 300 exist unmounted down
INFO: backup mode: stop
INFO: ionice priority: 7
INFO: creating archive '/backup/vzdump-openvz-300-2014_12_31-10_40_52.tgz'
INFO: Total bytes written: 10240 (10KiB, 145MiB/s)
INFO: archive file size: 0KB
INFO: Finished Backup of VM 300 (01:21:28)
INFO: Backup job finished successfuly