Today I read "If I could open an old document that already has right settings, and save a New Document Preset from this existing document, it would be a big timesaver."
That’s what scripts are for.
I just got an email telling me that this very very old script of mine stopped working under CS5
The script automatically creates a backup copy of the current document while saving. Apply cmd-S as shortcut for the script and you won't notice it is there.