[Samba] re installing samba PDC on the same server ?

[FM]

Hello,
I am upgrading my PDC server and samba. For samba it's a minor update
(samba-3.0.9 to samba-3.0.10).
same server name, same ip, same DOMAIN et same NETBIOS NAME. All users
are in ldap (not the same server).

I do not want to join all stations again so it is ok to :
backup /etc/samba
backup domain sid using net rpc getinfo

aftter the upgrade :
install the new version.
add the ldap password in the secrets.tdb
use net setlocalsid SID
use the backup (smb.conf)
start samba

Is it a good technic ?

Thanks !