Google Photos
From IndieWebCamp
Google Photos is a photo storage silo that incorporates machine learning tools to organize and categorize uploaded photos, as well as generate presentations called 'stories' based on them.
At this time, Google permits easy access to download all of the photos uploaded into the service, however, this would be without the metadata it has generated to index it.
Examples
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David Shanske has recently(2015-11-13) begun using it as one of several places to back up photos also stored elsewhere, due to the advantages of automatic categorization.