Default [Q] Need help with CWM on Huawei Mediapad

I apparently screwed up my system worse trying to fix it because I couldn't seem to get anyone to help
(And YES I did try searching the forums and everywhere else too).

But now I've installed CWM and tried to backup my system but apparently there wasn't enough room and the system doesn't like it
because I get like 30 error popups telling me it can't start different things up.
So what I want to do is do a backup, wipe everything, install new firmware and restore my apps if possible.

What folders and files can I delete without affecting the minimal amount needed for CWM to run or touching the backup it makes?

I want to wipe everything else.

Is that possible?