Do it. Buy an hdd, start to understand how to store the data safely, how to torrent and how to contribute to the community.
You’ll learn a lot, and I am guessing that you are very young, all this knowledge will be very useful in the future. Every cent spent now, will multiply in the future
Or don’t, because they are going to kill it eventually.
There are less convenient possibilities, like pass and keepass, even a markdown file pgp encrypted and git. Yes, less convenient, but guaranteed to work in 5,10,20+ years