What happens in HA when I plugin a USB stick?

What happens in HA OS when I insert a USB stick? Are there any indications somewhere in the GUI? Will it be available to store files, like a backup? Thanks…RDK

Nothing

No

Depends.

Read here regarding backup

Then there are media folders

What is your goal? You cannot just plugin usb and it work but you can define extra storage for HA to use

If the OS does enumerate the device it will be listed in Settings → System → Hardware → All Hardware.