@jfg @woland and everyone else who has assisted, I'm SO grateful for your wisdom and time! These examples are just what was needed.

This forum and its community is wonderful.

Many, many thanks!

Simon

@jrhooker said:

I have a step back version but it's a whole day of work.

 Because I often work on things where I'm pushing Isadora to the absolute limit, I've gotten into the habit of making incremental saves every hour or two. I rarely need them, but when I do, I'm very glad to have them.