Found one at
http://newtonsoftware.co.uk/clone/. It's free for 30 days, then US$30 for single license, US$48 for 2-10 licenses.
It compares any two folders (or drives, if you wish). It looks at the first drive, makes a list, then looks at the second. If the parameters are correctly set, it will delete files from the second drive that are not on the first and add the files that are missing from the second drive. The result is a perfect clone of the two folders/drives.
You can set up any number of folders you want to have syncronized in addition to your Hoster files. You might want to sync your "My Documents" folder or your email files, etc. Just select the pair and assign the parameters, click and it does the rest.
It has the capability of using several methods of comparison, but date is the most common. Therefore, if you edit the songs database in Hoster, it will back up the entire file. If you change or delete a song, the songs folder will be updated accordingly. It is fast and so far, safe.
I ran several tests and no problems. It does have a few rough edges, but if you are careful, it will work as advertised.
Enjoy!!
DC
