Thanks so much for your help! Sorry if i'm being an idiot but i'm not the most tech-wavy and still a bit confused!
I changed the file name to .tar (it was "2014-05-01 14-27-54 - Matt e.kpabackup" and I changed this to "2014-05-01 14-27-54 - Matt e.tar". Is that correct?)
I then tried to 'decompress' that .tar file but can only see the option to compress it. Any idea why that would be? (I'm in a mac btw if that makes a difference).
Also, I can't see any 'rig' folder at the moment. Where should that be?
Alternatively, can I not just do a factory reset now that I have the "2014-05-01 14-27-54 - Matt e.kpabackup" saved on my computer, and backup from this if I wish to revert to the current settings?