Sony has updated Playstation Plus to include cloud base saves. This means all users of Playstation Plus will have their saves for their games stored in the cloud. So the next time your Playstation dies, or you log into another PS3 the saves will automatically download! Sony say you will get 150MB to store in the cloud and the update will come in v3.60 which is due tomorrow!
Possibly another reason to buy the subscription? We shall let you decide!