recommendations for File Syncing software?

I've got about 20 Hijillion photos and songs on various drives and I want to make sure that all the drives have the same stuffs on them.

What do you recommend?

I think Norton 360 actually has some sort of back up feature but I'd rather not get into that. I'm looking for something without a ton of bells and whistles.

I use ViceVersa which is free.

rsync

I got freefilesync. it did the trick