My whole setup including 2 PIs and one fully speced out AM4 system with 100TB of drives a Intel Arc and 4x 32gb ecc ram uses between 280W - 420W I live in Germany and pay 25ct per KWh and my whole apartment uses 600w at any given time and approximately 15kwh per day 😭
If you’re talking multiple Terrabytes and are located in the EU you might want to consider AWS Glacier I have like 6Tb on there and pay sub 20€ p.m. If you’re in the EU you can request one free migration download by contacting the support. Otherwise you’ll pay thousands.