Hello everyone.

I have been interested in starting to self-host, and I have just been able to set up the first useful thing for myself (apart from a PiHole that I have running).

Since I am very afraid of making security mistakes, I would like to get feedback from you if my setup is secure or not.

The simple use case: I want to be able to back up files from my main computer to a hard disk, without having the hard disk attached to my main computer.

The setup:

• A Raspberry Pi 4 running Raspberry Pi OS Lite (64-bit).
• The Raspberry Pi can only be accessed via ed25519 key.
• I configured a firewall on the Raspberry Pi with ufw to allow only traffic from the local subnet.
• I then use sshfs to mount the hard disk connected with the Raspberry Pi to my main computer.
• I plan to use rsync to back up my files.

Now I need your help: how secure is this setup? Did I make any major mistake? Is there something I could do better?

I'd be happy to get some feedback... 🙂