rasito
what result backup server and than what can do restore to other machine server ?
because i don't want to users join domain again
I think you may be asking to what extent the backup covers, and if it includes the config data necessary to allow users to login to the domain on the new server.
A normal backup will include all user, ibay, db, mysql & server configuration data. This includes machine accounts which are involved in the workstations logging into the domain.
As machine accounts are restored, then existing workstations that are already members of the domain will be able to login as usual (without having to rejoin the domain).
Note that for all supported backup/restore methods, you will need to reinstall any add on rpm contrib packages that were installed on the old server, as these are not included in the backup/restore. The configuration db data & custom templates etc, for these contribs will be restored, so you won't need to reconfigure them.
For various contrib backup solutions see,
http://wiki.contribs.org/Category:Backupplus of course the standard built in tape backup and backup to desktop & backup to USB functions.
Note the only recent exception to machine accounts not being restored properly, related to upgrades & backup/restores from sme6 to sme7, where for some unknown/undetermined reasons perhaps to do with the new version of samba, some systems did not allow workstations to log in to the domain after a restore. In that case workstations had to unjoin and rejoin the domain. Search bugzilla for the bug report.