Sorry you may find that both data sets have been trashed. If the set that has been trashed syncs itself to the older "good" set it will trash the good data set.
You do not want backups to talk to each other under any circumstances.
Cheers
Guy
I keep my FTM tree on a cloud service, and sync to ancestry. Safest way I know.
Martin
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I used to host a number of my webpages on Rootsweb, a cloud service that made frequent backups. This all worked fine for around 15 or so years then one day a large number of the Rootsweb pages disappered, after about a month an apology was presented with the news their backups had also failed, luckily I had all my work on my desktop computer here at home and was able to more or less replace what was lost on a different server. I say more or less as I have still (about 7 years later) not updated a number of the interconnecting links, all the pages can be viewed but a few of the convienient links between the pages do not connect as they point to old servers.
That taught me never to trust automatic backups, syncing etc., instead I use manual backups and check each backup before I rely on it to be safe.
Ok some may think I have lost the plot but better that than lose years of work.
Cheers
Guy