I have exactly the setup you described, a Raspberry Pi with an 8 TB SSD parked at a friend of mine. It connects to my network via Wireguard automatically and just sits there until one of my hosts running Duplicati starts to sync the encrypted backups to it.
Has been running for 2 years now with no issues.
I bought a Model 3 in 2019 with a 50 kWh battery and can confirm that 50 kWh is more than enough for the average person given that efficiency is up to par.
It is now 5 years later and the 50 kWh Model 3 is still the most efficient EV.
Since then everyone just slapped bigger and bigger batteries onto their cars to get larger range numbers, driving up price and reducing efficiency.
I'm excited that we finally see an EV that values efficiency again with the Aptera.