Thanks… So that would save a copy when I don’t touch rhino for, say, 20 minutes. However, if I pause for less than 20 minutes at a time it would never save. Is that it?
But come to think about it, if my scripting skills were not so rusty it would be relatively easy to script a regular save… and maybe also delete the previous version, or two versions previously… we could call it RegularlyProgrammedSave … 
not to confuse it with AutoSave …
I’ll give a try to the idle processor, and see how much the incremental files annoy me at the end of the day…
N