Comment on SABnzbd

There is definitely a lack of documentation, but as with all the best things a little bit of effort is all thats needed.

Yes it uses backup servers, it calls them fill servers it is simply a checkbox on the config page.

By far the best Usenet tool for the mac, topping Unison, if not through ease of use, but by simply unpacking the files for you after download - an invaluable function.