“The t520 consumes 6W at idle and 10W otherwise.”
Apple killed Time Capsule and left Mac owners to fend for themselves. A used HP t520 thin client off eBay costs $25 and about $19 a year in power at $0.35/kWh. A Raspberry Pi costs $80 and up before the case and power supply. Corporate e-waste beats the hobbyist board on price.