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I restored a backup database on the 1-June-2021, this backup had 3 months of data lost, and 3 days later, restored a new backup with the 3 months lost data, now this new restore loses the 1st to 3rd June data in the database.
Problem:
How do I sync or insert the 3 days data into the newly restored database?
You cannot. In order of do a properly backup, you should do make it of your database and content store. Both should be sync. If you don't have both sync, then Alfresco won't recognize those data (assuming you are restoring only in your database).
Some documentacion related.
Cheers.