Delete File History files

Just started running file history, seems like it might be a good feature. It backed up a lot of stuff that wasn't necessary and its seems to be a hassle to delete them, is there any easy way?

I backup to a folder on an Ubuntu computer through my home network. Even as I write this I'm deleting a folder with ~5000 items, it says its going to take over 3 hours, when that happens I go down a layer and start deleting folder from there. Oops, after about 5 minutes, up pops "Could not find this item", check "Do this for all current items", then click Skip, another 20 seconds or so it's done.

Any ideas?

Jim