Hi
Thanks for your reply.
Seems for add an options on tar command, not gzip.
"If you want to add extra options to the tar command during the backup process, you can add it in your directadmin.conf"
Anyway I going to try it.
What you might want to do is make admin backups and uncheck the mail and domain data. That gives you a much smaller tar.gz in /home/admin/admin_backups. Next you simply rsync everything in /home/ to get the tar.gz's and the domain/mail data.