Seafile

Seafile is the Den’s file sync and storage — fast, focused, and good at exactly one thing: keeping files in sync across devices and stored under the custodian’s own roof. It runs as a Docker container on the Den’s Engine (Zone 1).

It was chosen over an all-in-one platform deliberately: in the Den, each function gets the best tool for it rather than one suite that does everything adequately. Calendar and contacts are handled separately, by Radicale.