I have tried to backup/restore the full database with mysql export/import.
The problem it′s always crash it (I backup from 2.1.2 and tried to restore in a local beta 2.8… I′m not sure if the codification can be the problem), and the only way to restore is from export/import option inside WP, so to don′t have problems in the future, I don′t want to use mysql :S