Genuine question, not a gotcha. I have run the Sunday sync for three years. If Ilya is right that the restored copy is someone else, then I have spent three years doing a favour for a stranger who will have my face.

Yes. That is exactly what you have been doing, and I think it is more generous than what the parent line thinks it is doing, not less.

This is where I get off. If the copy remembers the sync, intends what I intended, and keeps the ledger I kept — I do not know what further fact about "me" is supposed to be missing.