You can set an auto backup every so many day's or manually whenever you feel the need for it. You can leave the backup file where it is or move it somewhere else if you prefer. Just make sure you remember where it is if you ever need it to do a restore.
It may not know the newest backup but you can tell. When the backup file is made it will also include the date the backup was created so you can easily tell which one is the latest backup you've created.