Can be achived with proper db support. Also revision, drafts with edit times. And must have auto save times. I mean docs.google.com I love the auto save thing.
We will add auto save functionality to our future enhancement list. Thanks for your feedback.
The new version (3.0) will be released in two weeks. However, auto save feature will not be in the new version and we cannot promise any ETA for this feature at this point. Sorry for any inconvenience.