** Google Photos Sync.**
Google Photos Sync is a command-line utility which downloads your Google Photos to the local file system. It will backup all the photos the user uploaded to Google Photos, but also the album information and additional Google Photos 'Creations' (animations, panoramas, movies, effects and collages).
In order to work, gphotos-sync first needs a valid client id linked to a project authorized to use the 'Photos Library API'. It is not provided in the distribution. Each client id is given a (large) limited number of free API calls to Google Services. If this distribution shared the client id, all users would share this resource limit. This is a little fiddly but only needs to be done once.
- Create a project on Google Developer Console - https://developers.google.com/console/ , following the Creating a project procedure - https://cloud.google.com/resource-manager/docs/creating-managing-projects
- Authorize it to use the 'Photos Library API', following the Activating and deactivating APIs procedure - https://cloud.google.com/apis/docs/enable-disable-apis
- Create a Client ID by following the setting up oauth 2.0 procedure with application type set to Other - https://support.google.com/cloud/answer/6158849?hl=en
- Once the client ID is created, download it as client_secret.json and save it under the application configuration directory
Find out more from the upstream developer repo at: https://github.com/gilesknap/gphotos-sync
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