whatsapp/database

I took a backup of whatsapp/database folder. How to restore messages using backup? My saved database files are like: msgstore.db.crypt8 msgstore-2015-01-03.1.db.crypt8 msgstore-2015-01-04.1.db.crypt8 msgstore-2015-01-05.1.db.crypt8 1) Keep t in internal storage under whatsapp /databases...