Question regarding running full node

I want to run full node at home using SBC (raspberry or orange pi) connected to my VPS with I2P and Tor router on it. Any tutorial / thoughts on such configuration will be appreciated. The idea to to route it via VPS is to avoid internet provider see my tor/i2p connection up 24/7 on the other hand I don't want to run the node itself on VPS. What are minimal hardware requirements to for running the node? Could / should I use SD Card (128/256 GB) or external drive (USB3 SSD) or I must have SATA HD ?