I keep photocopies of my favorites in a set of filing folders. Each folder is labelled for a category: meat, poultry, seafood, vegetables, other sides, pasta, etc. The folders are all stored in a small filing box.
I like this system because it's easy to stuff new recipes into the appropriate folder, it fits any size paper including 8.5x11 photocopies or handwritten post-its, and it's easy to find things without constantly having to re-organize stuff. I copied the idea from my mom, who has been doing it this way for as long as I can remember.
I would love to move to an electronic / on-line system, but haven't found the time to scam several decades of collected recipes. Plus, I could never keep up with scanning new ones. And I like having a hard copy out while I'm cooking. Yes, I'm old fashioned

.