You'd want to used the "-force" option if the new server has a different hostname.
http://www.cisco.com/en/US/docs/net_mgmt/ciscoworks_resource_manager_essentials/3.5/user/guide/ug_appc.html
"restorebackup.pl
Restores an earlier backup of the database.
$NMSROOT/bin/perl restorebackup.pl [-force] [-s groupName] [-gen generationNumber] {-d backup directory}
This script can be used for user-specific requirements to:
â¢Restore only one group. For this, use the '-s groupName' parameter.
â¢Restore all groups. For this, do not use the '-s' parameter.
â¢Installed suites that includes Common Services and Essentials.
â¢See a list of the available backed-up generations. For this, enter the following at the command line:
$NMSROOT/bin/perl restorebackup.pl -h {-d backup directory}