Nagios Support Forum

You mean the data files? I can't recommend that you replace the flat data files, I can virtually guarantee that will result in corrupt databases.

Restoring should be done with the proper client tools mysql and/or psql.

The postgresql database name is nagiosxi
The mysql database name is nagiosql

i restored old backup as image, then i stop all services and restore all latest backup file for /usr and /var, and server returned up to date.

Is there anything else we can do for you, or are we all right to mark this one as resolved and close it?