vzdump is an utility to make consistent snapshots of running OpenVZ VEs. It basically creates a tar archive of the VE private area, which also includes the VE configuration files.

There are several ways to provide consistency:

Taken from proxmox.com.

Icon  Name                                               Last modified      Size  Description
[PARENTDIR] Parent Directory - [DIR] old/ 2016-05-15 17:00 - [   ] vzdump_1.2-4_all.deb 2009-10-22 16:25 26K [   ] vzdump-1.2.tar.gz 2009-10-22 16:25 20K [   ] vzdump-1.2-4.noarch.rpm 2009-10-22 16:25 29K [TXT] HEADER.html 2007-07-09 16:06 532
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