I've never actually used it for editing documents, I just use it more as a Dropbox replacement for backing up / syncing files.

In that case, depending what your actual acceptable risk/goal is... continue using Google Docs and set up a regular backup? Your worst case is that Google Docs goes away tomorrow, and you still have all your data you just need to spend a bit of time restoring to a different account / setting up alternative software / etc and move forward from there. For most people I expect that's more than enough.