Unfortunately, "autosave" is a feature I abhor. It is actually dangerous without a versioned storage behind it. It will not be coming to Sigil.
Often I am in the middle of editing something and it is not in a state that should be saved - especially over the top of the last version of the file I may still yet need to revert to! I have always strongly believed the user should be in full control of when to do a save.
Perhaps if you look in the Sigil User's Manual and read up on Sigil's CheckPoint feature that with a single click enables you to save multiple versions of your epub into a github like repository for later checkout.
If the reason you want "autosave" is because Sigil is crashing on you, then I strongly recommend you find what is on your system that is interfering with Sigil and fix it.
Crashes in Sigil are and should be really really rare. And based on a user-base of tens of thousands with no active crashing bug reports currently open, that is still true.
Any time a crashing bug is reported (and recreate-able) it is always fixed in the very next release of Sigil. If you are experiencing such bugs, please report them here with instructions on how to recreate the bug (or use our github issues for that).
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