I also stopped using Dropbox for a while, but after all found it the most reliable sync solution between DT and DTTG. Apple’s iCloud is nice but unreliable, and you have less to no control on synchronization process or history.
That’s why I moved back to Dropbox for standard synchronization of my ‘open’ databases; couple of projects and my main inbox. The rest of the databases are on macOS only, also synced to Dropbox. As far as I know this sync is encrypted.
Every month I running an incremental backup job to a some locally encrypted ‘cold storage’ databases. Those encrypted databases are closed and as-is backup’d to a cloud storage (so not synced).
