For My Dearest Readers: Cosmetic Back-ups. Do you hoard or do you scrimp?

Recently, I have found several products that I consider my Holy Grails. For example, the Biore UV Bright Face Milk, and the Neutrogena Skin Enhancer Tinted Moisturizer. (reviews soon) and some other products as well.

These are not readily available in the Philippine market and has to be bought through pre-orders. A bottle of those products can last up to 6 months or more which I guess the right amount of time to purchase before it runs out. But Im thinking about getting 2-3 backups for safe keeping so that if ever I run out, I dont have to go crazy looking for a substitute.

For my dearest readers:Do you store backups? Why? What is the reason? If yes how much do you hoard?