I’ve had an oversupply and exclusively pumped with both of my children. With my first I donated about 600 oz at a time. I bought a second deep freezer for only breast milk. With my current 3 month old I’ve donated twice already, 1000 oz and 600 oz. This may be what ever your personal preference is and your freezer space. That’s why I donated so much already, my deep freezer I bought with my other child decided to go out over the summer and I haven’t bought another one. I do always like to keep about 100 oz just incase. After I bought the second deep freezer, I was able to store enough to stop pumping between 9-10 month and had enough breast milk to feed my baby till she was well over 12 months old. Also, not sure how you’re storing your milk in the freezer, but I’ll freeze my bags flat, then add them to a gallon freezer bag and make a “milk brick” of about 10-12 milk bags 5oz each. I label the gallon bag with how many oz are in it, the dates of milk in the bag, and I number the bag, I keep written documentation of what I have in the freezer so that’s where the numbered bags come in handy, to know what milk I want to donate/keep… I’ll also write on the bag if there’s any reason I don’t want to donate a certain bag of milk (colostrum, I do have some frozen milk with a small amount of blood from nipple damage that I’ll feed to my own children but don’t want to donate to someone else.) It really helps with freezer space and keeping milk organized.

I personally always saved as much as i could. With my first i bought a deep freezer because the milk will last longer in a deep freeze. If youre using a fridge freezer you should consider donating the oldest milk to rotate it if you are still putting milk away