> However, it's not that a similar thing is unseen elsewhere. If I delete some text from a document, save, and close the application, and in 5 minutes, I want to get it back ... If the user wants to keep the original, they just use "Save as ..."

That would put the responsibility on the user to remember all that. If I decide to do something like that, I'll need to save the original myself, and allow the user to go back to it.

But yeah, now I get the appeal of having something like this. I've added it to my todo list -- if enough people want this, I can certainly implement it (it would disrupt quite a bit of my internal workflow, since I view "videos" as constant, and optimize them as such. so I would need to find a workaround for editing in place, but it's certainly doable).