what is enough memory?

Ever since I started taking photographs and storing them all on my computer, I've been a bit worried about running out of memory space. I decided to check up on if I needed to increase the ram or random access memory on this laptop, and if my external drive would be enough of a backup. Well, it turned out that I was worried for no reason at all, since I have plenty of space still available, even with some of the large format photographs that I have been taking. The good thing is that one can easily upgrade one's memory capacity whenever one needs to, so there is always a solution handy. Just imagine if one could do that in real life too!