This is a documentation of the (rather crude) calculations that I did to determine the power usage of the managing server. The server pulls 46 watts when idle and 92 watts while the disks are spinning. Between 26th of February and 23rd of March, 25 days have passed. In this time, 117 builds have been uploaded, averaging to about 5 builds a day. With my average upload speed to Backblaze of about 1.2 MB/s and an average build size of 737 MB, a single build takes about 9.5 minutes to upload. In addition to that, to avoid spinning up- and down the disks too often, the server is configured with a 5 minute disk spin-down time. Therefore, with 5 builds a day, the server spends 72 minutes with spinning disks just on uploading builds. LineageOS currently builds 155 devices weekly and 53 devices monthly, which averages out to roughly 24 builds a day. The current build rosters average build size is about 794 MB. With an average download speed of 1 MB/s, the server spends about 317 minutes a day archiving builds. In sum, the server spends 389 minutes a day with spinning disks, resulting in a power usage of 596 Wh. Applying the current average German electricity price to this (which was about 48 Euro-Cents/kWh in the beginning of 2023), this results in a cost of about 28 Euro-Cents per day.