I am a bit confused about the Snapshot config for S3. I set

I am a bit confused about the Snapshot config for S3.

I set up a backup bucket...xxxxx...and then set up a folder within that bucket for each of three websites...xxxxx>>jm, xxxxx>>csc, and xxxxx>>hsi.

First question: Should I have just set up the bucket and let Snapshot create the folder? I ask because after running a snapshot the bucket>>site folder I created is empty, but the bucket itself shows, besides the empty folder, a bunch of logging files. I don't see any backup zips, and this is the same for all three sites I've set Snapshot up on.

Second, when I set up S3 for my backup destination, is that INSTEAD of my server's site files or in ADDITION TO them, and is still loading my hosting account?

Thanks
Bob