I would like to have the autosave future configurable. Personally, I would turn it off on my Mac. First, I will comment a post written by someone before: "It wastes hardly any space (these are delta updates) " - I don't even imagine delta updates of JPEG or PNG files. Basic text files (that are usually relatively small) - yes, I agree, but as it comes to word processing documents (doc, odt whatever) - it won't be so easy, and these files can be much bigger. The other thing is that some ppl might have some very private text files and they would not like to have them in multiple copies on HD (btw, where the hack these versions are kept anyway?).
But, to the point, I have Lion for just few days and I already messed up some of my pictures, not very important though - no big loss. I wanted to make a low res copy of the image to send it via email, I used Preview app, I have resized it then I quit thinking that changes were abandoned, then I moved images to the external drive (HFS too), and bang ... I discovered that picture is down sampled. I clicked around a bit and I found out that there is an option to revert changes.... but no other versions were found, since Lion apparently lost track of them during the move operation. So... it *is* dangerous and inconvenient. Now I have to avoid autosave aware programs, or in the first place make a copy if I want to change them (in Preview App, you just experiment with colors etc to check how it would look... and you don't remember whether you made a copy or not + if you do, but no changes made, remove useless copy).
Gosh, I think the whole world is going to nowhere :/ and very soon I would need to go back to linux.
Wow - that is scary. I think I saw a way to go to into Terminal to disable AutoSave for certain apps (like having it disabled only for Preview or Garageband).
Either way, I agree, options would be nice...