The only data that TimeSync will access from the various services that it connects to is data that will then be passed directly to the Pebble servers for the creation of Timeline pins.
Some of the data is stored so that if it changes, the differences can be compared and used to generate the appropriate update to your Pebble timeline pin
Whenever possible, all requests will be made over HTTPS/SSL.
If you prefer, this data can be deleted using the watch app at any time (and the service will continue to function).
You can also (using the watch app) unsubscribe from any connected service at any time.
Your data will never be shared with any third party.
The source code for TimeSync is available at Github under the Apache 2.0 license