I now have a lot of work that I have done on iOS iWork on iPad, particularly Numbers files. It occurred to me that these files are not backed up anywhere other than on iCloud. Since there the iPad and iCloud are obviously always in sync, if somehow the files got removed from iCloud by an error on Apple's part (which has happened several times in the past) I would lose all my work. Is this correct? If so it seems to be a fairly big weak point. What do other people do to back up their important iOS iWork files. I couldn't afford to lose the work I have done so far... Are there any solutions?