And as I said -- based on my understanding of how it works when a PC is in use but Dropbox was not started in a while, the client will record the state of the local files and the sync status. If the files have not changed locally since Dropbox ran, it will assume the cloud changes are authoritative.
If restoring, there is no doubt in my mind that it is the equivalent of syncing calibre, turning off the PC for a year, updating file on other computers, then coming back to the old computer and starting up the Dropbox client. It will download changes from the Dropbox server, overwriting the stale data saved locally.
If you hd changed files on the PC since the last sync, the checksums would mismatch and the dropbox client would upload the changes. This would be reported on the web interface with an option to revert. Like always. There is a good chance Dropbox would sense a conflicted copy situation, too.
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