no, that backup in the admin panel is just for the database.
the extensions, images, etc. are all in the files which are in a completely different place on the server.
to back them up, you do a backup of all the files using ftp.
then, in order to completely recover back to the beginning, you would have to import your database backup ( sql file ) to the database on the server and also, upload all of the files that you downloaded using ftp, back to the server using ftp.
then you should have a completely recovered board.
this type of backup is only needed just to be safe. when doing an update/upgrade etc. you do that backup first, just in case the aliens come in and zap your server or something while you are doing the update/upgrade.
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