Sync your board between devices via your own server (Vercel + Supabase). Changes made on two devices are merged card-by-card, so nothing gets silently overwritten.
The BOARD_TOKEN you set in Vercel → Settings → Environment Variables.
Write this key down and keep it somewhere safe. It is the only thing that ties this board to you. Without it you cannot get your board back on a new device, on a new address, or after clearing this site’s data.
How to set up:
Enter the token above and hit Connect
On your other devices: open this same URL and enter the same token