Your songs have no business
in a data center.

Where do your files go today?

When a band shares its rehearsals through an online storage service, every WAV, every Cubase project, every unreleased demo is copied into a data center: a huge building full of servers, owned by a large company, often in another country.

The same goes for AI practice apps: to separate the instruments or find the chords, your song is sent to their servers. You pay for the space every month, per account, and the price follows the gigabytes. The rules (prices, quotas, terms of use) are set by someone else and can change at any time.

What 28JoursBox does differently

Costs, laid out plainly

With an online service, the bill grows with the volume and the number of members, and comes back every month. With 28JoursBox, it's a one-off purchase and the electricity of a PC. Here are realistic orders of magnitude, not promises.

Electricity estimated at €0.20–0.25 per kWh. A mini-PC that draws 10 W costs about €20 a year. If the PC is already on for other uses, the extra cost is almost zero.

Taking back control of your data

• No account at a company. The band is its own host: one pseudonym per member, one group password, and the admin is one of you.
• Your files stay ordinary files. Each member's PC has a normal folder, readable and usable without 28JoursBox. Uninstall it: your files stay.
• Your rules. You decide how long versions and trash are kept, who joins, and who is removed. No terms of use that change overnight.
• Unreleased stays unreleased. Your demos and the AI analyses of your songs never leave your PC. Public links are created only when you decide.

Energy, without greenwashing

According to the International Energy Agency, data centers used about 415 TWh of electricity in 2024, around 1.5 % of the world's consumption, and this should double by 2030 (about 945 TWh), driven largely by AI. A single typical data center uses as much electricity as 100,000 households.

28JoursBox doesn't claim zero impact: a PC at home uses electricity too. But it replaces distant, duplicated, always-on servers with a single PC that your band controls, often one that already exists. Heavy processing runs at night, one song at a time, at low priority. And a 4-minute song is analyzed once, not every time someone opens it.

Source: IEA, Energy and AI (2025).

The flip side of independence

Bringing your data home also means taking on what a provider used to do for you. We'd rather say it clearly.

• Backups are your responsibility. Copy the server's data regularly to an external disk, ideally kept in another place. The user guide shows how.
• The server PC must stay on. If it breaks down, members keep their local copies, but sync and the phone app wait until it's back.
• Security is shared. Keep the group password within the band, change it if the link leaks, keep Windows up to date. From outside, access goes either directly to your router (a port you open, protected by HTTPS) or through an encrypted tunnel (Tailscale), a third-party service that relays traffic but stores none of your files. Updates for members' PCs are signed, and each PC checks it is really talking to your band's server.