observantTrapezium

To my knowledge it’s not supposed to differ.

If you trust that the client (which is open source) is doing what it’s supposed to do, security-wise I don’t think there’s a difference between self-hosting and using Bitwarden’s service.

No, you don’t need to trust the VPS provider. The VaultaWarden password storage is encrypted, and the master password is never transmitted to the server. The passwords are decrypted only locally on your device.

For files I just use WebDAV that’s built in to Apache. It’s really not fancy, but does all I need.

I use RoundCube, I think it’s one of the oldest solutions out there, and is pretty good (and not ugly as of a few years ago).

That’s very unfortunate but hopefully you developed skills that will help you in your future career.