[Feature Request] - Native ZimaOS-to-ZimaOS Backup Push + Encryption Support

[cmddel9]

Description:
I'd like to propose two key enhancements for the ZimaOS Backup app to improve remote backup workflows:

1. Direct Push to Remote ZimaOS NAS: Add built-in support for selecting another ZimaOS device as a backup destination. Use ZeroTier Network ID or Remote ID for automatic discovery and connection, eliminating the need for manual SMB share mounting. This would enable seamless 3-2-1 backups between Zima devices over WAN.

2. Backup Encryption: Introduce AES-256 encryption for all backup tasks (full, incremental, versions), with user-managed keys stored securely in the app. Encrypt data both in transit and at rest on remote destinations.

These features would make ZimaOS a more complete offsite backup solution, aligning with best practices for data security and simplicity.

Thanks for considering!