GooglePhotoSync
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Local file times are updated when the file is synced to the cloud
Unfortunately, Google's Picasa API doesn't allow the LastUpdated date time to be explicitly set on an album or photo. This means that in order to track whether a local and remote file are in sync, I workaround it by updating the local file to the same date/time as the uploaded picture. Hopefully I'll be able to fix this in future.
Maybe a better way to handle this would be to store the last time we synced in metadata in the actual image.