It was across several documents (I have 7 I think.) I had just done quite a bit of restructuring the LINKS doc with the intention of trying DL as my everything bucket for saved topical clips from the web (URL and TITLE plus keywords or tags and comments/summary.
To revert to an earlier backup would have lost that flurry of creation of environmental subcategories etc.
I will know next time--if there is a next time--to get in touch ASAP with a request for a finer-grain backup. And I will be more careful after making many changes to do a manual backup.
Thanks for standing watch! -- Fred