Kenneth Fisher shows how to see which backups you have in a particular .bak file:
Restoring a backup file is pretty easy right?
1RESTOREDATABASE[Test]FROMDISK ='C:\backups\backup.bak';Ok, but what if more than one database backup is stored in that single backup file? Didn’t know you could do that?
Yep. You can.
Read on for a couple good points regarding those backup files.