Feature Request: Hybrid Login & Sync with Bitwarden.com Account

It would be great if Vaultwarden had a built-in feature to automatically sync a vault from an official bitwarden.com account.

The idea is to have a section in the Vaultwarden user settings where you can enter your bitwarden.com credentials. The Vaultwarden server would then use those credentials to periodically fetch your cloud vault and sync it (one-way) into your local Vaultwarden account.

This would all happen server-side, making it a "set it and forget it" feature.

Why?

• You get the best of both: Bitwarden's official service plus a local copy for offline use and control.
• It's the ultimate backup. If Bitwarden.com is down, I can still use my local vault.
• It guarantees offline access to my passwords.
• Makes having a local copy super easy, no more manual exports.