[quote=@Ardent Dawn]One of the nice features about Google Drive is that it saves the full edit history for any documents that you make, so it doesn't matter whether any accidents occur with the back-up - you can just roll back to a previous version. Everyone can edit the Google Doc, so feel free to copy/paste back-ups over whenever anyone feels like it.[/quote]
TitanPad can do the same: Saved Revisions and Time Slider allow you to access about any version that's existed at any given time.