With Flickr you can get out, via the API, every single piece of information you put into the system.
Every photo, in every size, plus the completely untouched original. (which we store for you indefinitely, whether or not you pay us) Every tag, every comment, every note, every people tag, every fave. Also your stats, view counts, and referers.
Not the most recent N, not a subset of the data. All of it.
It’s your data, and you’ve granted us a limited license to use it.
Yep, this is why I love Flickr.