For what it's worth, you can make a copy with "File > Make a copy" and delete the edited doc. The copy will not preserve history. You can verify this yourself - after making the copy, the only thing in the copied doc's revision history is a single change that adds the entire document's contents.
This shit is the reason why we use LibreOffice online, running on my own server when an "office" thing is required. I can access it from all over the 'net, documents only leave my network when I want them to, nobody gets to data-mine them, it has supported nearly everything I've thrown at it.
This sh*t is the reason that I carve my words into clay tablets using LinearB and have an army of assistants to translate and upload them. The only downside to this is that the change history is a bit of a mess until it's cleaned up and uploaded.
