Floppy discs were so great. Sure, flash memory has way higher capacity but the cards are so tiny. It's a lot harder if you want to keep them in a folder for archiving. And before that we had CD-RW which was okay but the discs started to lose their write capacity a lot sooner than other media.
I still wish we had something with the form factor of a floppy disc but the memory capacity of modern storage formats. That's why UMDs were so cool in my opinion but I don't think they ever released a writable version commercially.
But on the subject of time travel, I was ostracized in sixth grade because I tried to explain causality loops and time travel paradoxes to my friends but they were raised on a steady diet of science fiction television and accused me of being fatalist. Fast forward to about decade later when I was taking Philosophy 1000 in university, I felt very vindicated. Young me was ahead of his time.