I rejoined flickr recently
I've been using flickr on and off for 20 years now, so my flickr time stream gives me a nice snapshot of how my photography has changed and improved over the years.
In theory, I've got all of my old photos available, but on flickr, the ones I posted are the ones I considered my best at the time. So my flickr timestream gives me an perspective on my photography that the 10's of thousands of photos in my home collection does not.
It's been really interesting going back through my old photos and seeing the change first hand...