Was für die eigene Sync-Lösung spricht …

Private-key Encryption
In 2016, we will develop and provide full private-key encryption on the server for our soon-to-be released 2.0 iOS and Mac apps. Our encryption features will utilize the user’s private key to encrypt all entries before they reach the server. In short, the server will have no access to the user’s unencrypted data. Neither iCloud nor Dropbox currently provide this level of security, thus making Day One Sync even more secure than these other sync/backup methods.