I would defo recommmend backing up!
Just before Xmas something went tits up and it looked like i lost a load of work. I ended up having to buy a hard drive recovery program to get the info back - even now i haven't got half of the info back so i'm a bit screwed. Lost like 3 years worth of Emails which were kinda important for our non adult stuff.
I feel like a right
But now got a backup plan in place so shit like this doesn't happen again!! So always remember to backup regularly as it can and will happen one day when you least need it.