I guess yes, but using custom cron jobs, not by the web gui or special proxmox tools.
You can use the proxmox cluster filesystem, replicated to all nodes, just like the regular web gui backup does
see
ls -la /etc/cron.d/vzdump
lrwxrwxrwx 1 root root 20 May 18 2012 /etc/cron.d/vzdump -> /etc/pve/vzdump.cron
Marco