I dont have any answers for you, but I do have a suggestion. With the ipad, any changes are supposed to be saved instantly, so there is no backup timing, it is just always backed up. That being said, it's obviously not working that way for you. Until it's resolved, I would recommend that when you open a document, you save it as another name (Mydocument becomes mydocument2, etc). This way, if it crashes, the file won't be overwritten by the old version, as that will have a different name. I would probably also exit out of the document briefly every 45 minutes or so, and open another one, then go back in. Hopefully this will trigger a reset on the 'clock' so it doesn't keep crashing.
I know that Apple had some problems with icloud over the weekend. I'm ot sure what they were, but possibly iWork syncing was one of them?