Do you keep backups of your favourite products, whether limited edition or permanent?

I did this with the Annabelle Smudgepaints. They’re the only gel liner I use in my professional kit so when I found out they were being discontinued, I bought 3 of the black one and 3 of the dark brown one.
I really love MAC Nude on Board bronzer and although it was LE, I didn’t buy a back up. I’m kicking myself in the behind on that one!