Create a web interface that works with trezor bitcoin

[JamesANZ]

• Sign nlocktime tx with trezor
• Download backup as a .md or .txt
• If recipient is not set, generate a new key, set it as the recipient and add the private key to the backup file
• Download calendar reminder
• Include a revoke transaction that spends the funds back to the signer's address

This would be completely non custodial and could later include alerts that watch the user's wallet for transactions that invalidate the backup.

[JamesANZ]

Another option could be forking the Jade firmware to create backups each time a transaction is done via the wallet.