Open google Play Store download Google drive on your device if already have google drive no need to download it just update and open it.
Touch on "+" option down of your right hand.
Touch on Upload option
You most login with gmail Id
Finally select videos/photos and other data which is you want to backup.
Upload process start.wait a minute until finished it.
When you upload photos,videos on google drive you can download from google drive if your data will be lost or deleted.you can use it any where if u have Internet.It also Increase your mobile memory storage.