When I started writing I had the fantastic idea to list everything I have in mind for my upcoming chapters in a “new episode” on the portal.
I had many dialogues and directing script lines written and when I actually wanted to continue my story, I deleted the lines I didn’t need yet, and copy-pasted to a new episode again and so on. Once I deleted my whole script, but didn’t save anything… And that’s the story how I finally memorized ctrl+c is cmd+c on Mac.
By the way, I don’t know whether you have noticed, but when you open a chapter on the webportal, there is a “See All Previous Revisions” option on the left side, below Script Tools. I just realized this like 2 weeks ago, but better late than never I guess
Of course you can check only your previously saved versions there, but it still can be useful sometimes.