You can back up the Search index using SearchService commands or you can manually copy the index files to a backup location.
Note that in IBM® Lotus® Connections 3, the Search index has a dependency on the HOMEPAGE database. The Search index can be backed up and restored independently of the HOMEPAGE database as long as the HOMEPAGE database remains current. However, if the database is restored, a corresponding Search index backup must be restored with it.
Parent topic: Backup and restore
Restoring the Search index