Papapapp:
This is not an easy question to answer, and it is part of the problem. For example in a previous message cocoofor.... wrote that I was spreading misinfo by saying that "revert to saved" does not give you back your last saved version. Actually, it is more complicated than that and it depends on your workflow.
Here is my test, with Pages. The result is: "Revert to saved" gives you the last version you saved ONLY if you call it immediately within the same session. Otherwise it does not just give you the versions you saved, but all the versions IT saved. That is, it pops up the full Versions window system and your last saved version is lost inside them. Which makes it useless. Here is my test, try it to see if you get the same.
-- open a doument.
-- save it
-- write 1
-- go get a coffee
-- write 2
-- go get a coffee
-- write 3
-- save. You last saved version is now 123
-- write 4
-- go get a coffee
-- write 5
-- quit
-- reopen
-- try "Revert to saved..."
What I get is NOT the version with 123 (that is the only version I have explicitly saved). What I get is two options: one, to go back to the last open version (that is, one with 1 2 3 4 5, and not the one I saved. (This is because quitting forces autosave of a version no matter what. It's true that YOU quit, but it's also true that in most cases you don't want to save what you did before quitting, and you are not asked now to save unsaved changes.)
The other option is to browse all the versions, and, there, I find five documents: one with 1, one with 1, 2, one with 1,2,3, one with 1,2,3,4, one with 1,2,3,4,5. Instead, I should only find the version with 1 2 3, if Versions gave back only the versions I save as Cocoofor.... suggested. That is, i will never be able to locate what was my last saved version, for what I can see.
Now, this may be Pages, but this is what it is (I actually think that's precisely how autosave works. It's not a versioning system, it's more than that: it's saving everything you do no matter what, at regular intervals).
This, of course, quite asides of all the other considerations about the utility of autosave, namely: because you have no version diffs, you can't even begin to understand which version you want to retrieve for minimally complex documents.
There are many better ways to implement this feature!
l.