What backup strategy is more preferrable?
Bring down the server at night and the copy the FDB file. When a
restore is needed put the FDB file back on the right location and
startup the server.

OR

use gbak command.

I want to have a solution in which my client can do the backups
himself so I don't have to do that. Is there a way to automate this,
so that a backup is made when the client starts a little program?