Rather than a data closet in Luxembourg, Isis uses a piece of software called Nextcloud. Developed by a German company and with its roots firmly in the open-source movement, Nextcloud is freely available for anyone to download and use, allowing its users to synchronise files across a group in a way that avoids any centralised hosting or control.
They are just using Nextcloud:
Rather than a data closet in Luxembourg, Isis uses a piece of software called Nextcloud. Developed by a German company and with its roots firmly in the open-source movement, Nextcloud is freely available for anyone to download and use, allowing its users to synchronise files across a group in a way that avoids any centralised hosting or control.