@Cptsavarus

Well, you could store the backup in a thumb drive.

Also, what your saying is it wasn't steam that used the match, it was "Someone" Interesting.

I see!

That's a kind thought. Thankyou!
It wasn't actually Steam that deleted my content though. The files were deleted locally as well. Let's just say a "certain young someone" accessed my computer while I was at work and clicked on a bunch of things they didn't understand... a really big bunch of things... things like Steam... and Regedit... and FDisk... click click clickclickclick - all gone! Thankfully it was just a games machine & there was nothing important on it.
It wasn't malicious - just very naughty. Suffice to say this certain someone has since learned their lesson and wont be doing it again!