dump -0aLf / | ssh user@backup-server dd of=/path/to/destination/data.dump

DUMP: Date of this level 0 dump: Mon Sep  1 16:52:14 2014
DUMP: Dumping /dev/vzfs (/) to /dev/tape
DUMP: Cannot open /dev/vzfs
DUMP: The ENTIRE dump is aborted.

tar --one-file-system -cjpf backup.tar.bz2 / /boot /usr /var"