I wiped my computer and setup everything new. I copied over the Databases from a Time Machine Backup and imported them in the newly DEVONthink 3.6.3.
I already synced my Databases via Dropbox and reconnected again with the sync store.
But what amazes me now is that apparently almost all documents are uploaded again?
Why is that? I don’t want to get any inconsistencies with my databases and syncs.