I had wanted to test something, so I turned off some preferences and did a download of transactions (Express Web Connect +).
After this test I copied back my data file before this test and did another One Step Update.
The result?
It put up this message:
And after that it didn't do the actually One Step Update. That is a bit of a bug right there, but not the point of this discussion.
I ran One Step Update again and this time it did the actual update. Which worked.
The only reason I mention this is because this is just an indication of why backup copies are no longer "safe". This was a change of only three transactions and on the same data Quicken had to sync with the Quicken Cloud dataset.
And if one thinks using "Restore" is better think again, the same kind of syncing is forced on that. The farther back in time you go the more likely something isn't going to sync correctly.