When there is a website that I want to save indefinitely, I will print it to pdf. It means I can go back in a few years after the site is offline or has rearranged its urls (thus breaking bookmarks.)

I mostly do this with order confirmation pages when I order off of random e-commerce sites, and with my bank when I use online bill pay. (And then if someone claims I didn't pay them, I go back through the pdfs and see if I made a mistake.)

More importantly, I "print to pdf" recipes that I want to save. Every year I print out the same turkey recipe, from a pdf, and then I don't need to worry about getting my phone or computer gross by interacting with it while I prep the turkey.