@codewolf2 Theoretically? Disconnect all devices from Sync, reset it, then connect the device that still has the correct data on it first and allow it to update the servers. You may also reset the data on the other devices (before re-enabling Sync on them) to make sure they won't overwrite data on the servers.
There may be ways to do it that are simpler, but that's the obvious one. Make it seem to the server like all the other devices have only just had Opera installed, so that it knows to only Sync to them rather than from them.
