Before you upgrade Plesk, it's always a good idea to make a backup and also make your ip and shell maps:
/usr/local/psa/bin/psadump -f /path/to/psa.dump --nostop --nostop-domain
/usr/local/psa/bin/psarestore -t -f /path/to/psa.dump -m ip_map -s shell_map
If you need to restore data, just drop the -t on the psarestore command.
