Upgrading from an older samba4 installation. * Stop any samba process * Backup your samba4 provision: go in the directory where your samba4 provision is stored (/usr/local/samba by default) do tar cf $HOME/backup.tar private (it's also recommended to save the etc/smb.conf and var/sysvol dir aswell) * Go in the source4 dir * run ./scripting/bin/upgradeprovision -s * do make install This will do the minimum (safest) upgrade of the data. Runing upgradeprovision with --full will do a more comprehensive upgrade of the data (including schema and display specifiers). This attempts to do a new provision, and to then copy existing data into that database.