I have a GP-10 to work on these days and it's fun - but I keep going back to the 99 because I'll be sitting in the car and go "hey, I wonder if you can do this with routing?" or a similar thought.
So the other night I just figured I'd mess around and see if I could get some sounds I never did before.
I ended up programming 27 different sounds in the space of something like an hour and a half. Crazy!
Stay tuned! More will be uploaded as soon as I can set up some assigns for these for those with FC-300 or other pedals.
That being said, I'm still using multiple USB flashdrives to make multiple backups of the patches in addition to hard drives. USB flash drives will hold a boatload of patches and then some. Try it!