This is something I remembered to do, knowing it would eventually come to this. 
Being a passionate gamer, I have a folder for savegame keepsake. These files eventually get back’d up, sometimes lost and almost never deleted. It’s amusing to know, no matter how crazy it sounds, that you might continue your game twenty years afar. Midst organizing and archiving these files (which is a dull task like many others), if you’re like me - you just love talking about games - this offers great insight. Ten or so hours gameplay into one or another new game title, you may decide to “pause” it in order to compare that experience to another, older one; which might happen to be your favorite.
The actual milestone, as you can see, is 10k archved files. It takes quite a chunk of proc time to compress this.
There is another archive, where I keep all the officials and nightlies amassed through the years of CataDDA-ing. 