EteSync
Armazenamento de Arquivos e Sincronia
Encrypted calendar, contacts and tasks sync.
Notas de Segurança
Data is encrypted and authenticated on the client (end-to-end). On the desktop, it integrates with existing software using a local CalDAV/CardDAV proxy. Changes to calendars and contacts (including deletion) are stored in journal and can be reverted by the user indefinitely.