Ever deleted a bunch of work...argh..gah...speechless

I needed to scan a file off my printer, so I used the memory stick with my edits from last week on it.  VERY BAD IDEA.  Apparently, very-crappy-printer likes to reformat memory sticks and create a new folder all it's own.  GAH!

Ok now, it's not like I deleted my whole WIP.  I had just reworked the first two pages of chapter one to really pop.  And I liked it--a lot.  

Deep breaths...

So, I found the most recent copy on my laptop and got to work with all the lines I could remember while they were still fresh-ish.

I do the memory stick thing so that I can work during lunch at my job and then take it home and keep going after the kids are in bed.  What do you guys do?
I'm seriously considering paper, but the versioning will be hell!!~