tx features a simple system for keeping tasklists up-to-date amongst multiple tx clients. Syncing is achieved using two components:

• Sync service: An HTTP server responsible for storage and communication with tx.
• Sync ID: A unique ID that the Sync service generates that can be used for identifying a particular tasklist.

Tasklists are loaded from a Sync service if it is:

• Configured to do so
• Has a valid Sync service and Sync ID
• The tasklist is not outdated (The local taskfile was not modified without Syncing)

To implement your own Sync service, create a HTTP server which mimics the JSON Blob API. You can then either pass your server's URL to --fallback-sync-url, use tx sync enable -u for a new tasklist or tx sync switch for an existing tasklist.