Back up

I back up all my photos to an external hard drive then in turn back that drive up to another external hard drive, so anyone know if there is any software that will automatically back up one drive from the other?

Carbon Copy Clone if you're on Apple...

Windows

Not sure how exactly you'd like this done, but FreeFileSync is the best Windows backup software I know and can be configured pretty much whichever way you like.

See also Automatic Backup with FreeFileSync | Alvin's Educational Technology Blog