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 - [TXT] HEADER.html 2007-07-09 16:06 532 [   ] vzdump-1.2-4.noarch.rpm 2009-10-22 16:25 29K [   ] vzdump-1.2.tar.gz 2009-10-22 16:25 20K [   ] vzdump_1.2-4_all.deb 2009-10-22 16:25 26K
Apache/2.4.62 (Debian) Server at de.freedif.org Port 443