Delete this thread please.
Media Tools Manager for Channels (a Streaming Library Manager extension) already has functions to do various Channels DVR clean-ups that release vast amounts of space.
I have mine set to remove recording logs and backups older than seven days...
So as of this exact moment, my backups are taking up 1.3GB and my recordings logs 28MB.
If there's another set of files you'd like cleaned in a similar manner, I'm sure it can easily be added!