While I was testing the backup result of Proxmox system by simply trying to restore I noticed the following:
INFO: restore QemuServer backup 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' using ID 104
INFO: extracting 'qemu-server.conf' from archive
INFO: extracting 'vm-disk-ide0.qcow2' from archive
INFO: Formatting '/var/lib/vz/images/104/vm-104-disk-1.qcow2', fmt=qcow2 size=32 768 encryption=off cluster_size=65536
INFO: new volume ID is 'local:104/vm-104-disk-1.qcow2'
INFO: restore data to '/var/lib/vz/images/104/vm-104-disk-1.qcow2' (11187322880 bytes)
INFO: 128+696776 records in
INFO: 42676+1 records out
INFO: 11187322880 bytes (11 GB) copied, 397.274 s, 28.2 MB/s
INFO: extracting 'vm-disk-ide1.qcow2' from archive
INFO: Formatting '/var/lib/vz/images/104/vm-104-disk-2.qcow2', fmt=qcow2 size=32 768 encryption=off cluster_size=65536
INFO: new volume ID is 'local:104/vm-104-disk-2.qcow2'
INFO: restore data to '/var/lib/vz/images/104/vm-104-disk-2.qcow2' (276934885376 bytes)
INFO: gzip: stdin: invalid compressed data--format violated
INFO: tar: Unexpected EOF in archive
INFO: tar: Unexpected EOF in archive
INFO: tar: Error is not recoverable: exiting now
INFO: 9+643738 records in
INFO: 48600+1 records out
INFO: 12740401152 bytes (13 GB) copied, 484.927 s, 26.3 MB/s
INFO: starting cleanup
INFO: temporary volume 'local:104/vm-104-disk-1.qcow2' sucessfuly removed
INFO: temporary volume 'local:104/vm-104-disk-2.qcow2' sucessfuly removed
ERROR: restore QemuServer backup 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' faile d - command 'tar xf 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' '--to-command=/usr /sbin/qmrestore vzdump-qemu-104-2013_02_02-09_06_02.tgz --extract 104'' failed w ith exit code 2
Here is the result/log of the backup
Feb 02 09:06:02 INFO: Starting Backup of VM 104 (qemu)
Feb 02 09:06:02 INFO: stopped
Feb 02 09:06:02 INFO: status = stopped
Feb 02 09:06:03 INFO: backup mode: stop
Feb 02 09:06:03 INFO: ionice priority: 7
Feb 02 09:06:03 INFO: creating archive '/var/lib/vz/dump/vzdump-qemu-104-2013_02_02-09_06_02.tgz'
Feb 02 09:06:03 INFO: adding '/var/lib/vz/dump/vzdump-qemu-104-2013_02_02-09_06_02.tmp/qemu-server.conf' to
archive ('qemu-server.conf')
Feb 02 09:06:03 INFO: adding '/var/lib/vz/images/104/vm-104-disk-1.qcow2' to archive ('vm-disk-ide0.qcow2')
Feb 02 09:27:14 INFO: adding '/var/lib/vz/images/104/vm-104-disk-2.qcow2' to archive ('vm-disk-ide1.qcow2')
Feb 02 20:12:16 INFO: Total bytes written: 282189200896 (6.73 MiB/s)
Feb 02 20:12:16 INFO: archive file size: 234.25GB
Feb 02 20:12:17 INFO: Finished Backup of VM 104 (11:06:15)
INFO: restore QemuServer backup 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' using ID 104
INFO: extracting 'qemu-server.conf' from archive
INFO: extracting 'vm-disk-ide0.qcow2' from archive
INFO: Formatting '/var/lib/vz/images/104/vm-104-disk-1.qcow2', fmt=qcow2 size=32 768 encryption=off cluster_size=65536
INFO: new volume ID is 'local:104/vm-104-disk-1.qcow2'
INFO: restore data to '/var/lib/vz/images/104/vm-104-disk-1.qcow2' (11187322880 bytes)
INFO: 128+696776 records in
INFO: 42676+1 records out
INFO: 11187322880 bytes (11 GB) copied, 397.274 s, 28.2 MB/s
INFO: extracting 'vm-disk-ide1.qcow2' from archive
INFO: Formatting '/var/lib/vz/images/104/vm-104-disk-2.qcow2', fmt=qcow2 size=32 768 encryption=off cluster_size=65536
INFO: new volume ID is 'local:104/vm-104-disk-2.qcow2'
INFO: restore data to '/var/lib/vz/images/104/vm-104-disk-2.qcow2' (276934885376 bytes)
INFO: gzip: stdin: invalid compressed data--format violated
INFO: tar: Unexpected EOF in archive
INFO: tar: Unexpected EOF in archive
INFO: tar: Error is not recoverable: exiting now
INFO: 9+643738 records in
INFO: 48600+1 records out
INFO: 12740401152 bytes (13 GB) copied, 484.927 s, 26.3 MB/s
INFO: starting cleanup
INFO: temporary volume 'local:104/vm-104-disk-1.qcow2' sucessfuly removed
INFO: temporary volume 'local:104/vm-104-disk-2.qcow2' sucessfuly removed
ERROR: restore QemuServer backup 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' faile d - command 'tar xf 'vzdump-qemu-104-2013_02_02-09_06_02.tgz' '--to-command=/usr /sbin/qmrestore vzdump-qemu-104-2013_02_02-09_06_02.tgz --extract 104'' failed w ith exit code 2
Here is the result/log of the backup
Feb 02 09:06:02 INFO: Starting Backup of VM 104 (qemu)
Feb 02 09:06:02 INFO: stopped
Feb 02 09:06:02 INFO: status = stopped
Feb 02 09:06:03 INFO: backup mode: stop
Feb 02 09:06:03 INFO: ionice priority: 7
Feb 02 09:06:03 INFO: creating archive '/var/lib/vz/dump/vzdump-qemu-104-2013_02_02-09_06_02.tgz'
Feb 02 09:06:03 INFO: adding '/var/lib/vz/dump/vzdump-qemu-104-2013_02_02-09_06_02.tmp/qemu-server.conf' to
archive ('qemu-server.conf')
Feb 02 09:06:03 INFO: adding '/var/lib/vz/images/104/vm-104-disk-1.qcow2' to archive ('vm-disk-ide0.qcow2')
Feb 02 09:27:14 INFO: adding '/var/lib/vz/images/104/vm-104-disk-2.qcow2' to archive ('vm-disk-ide1.qcow2')
Feb 02 20:12:16 INFO: Total bytes written: 282189200896 (6.73 MiB/s)
Feb 02 20:12:16 INFO: archive file size: 234.25GB
Feb 02 20:12:17 INFO: Finished Backup of VM 104 (11:06:15)