From John C.
Don’t believe the Mac rumors about storage and memory!
A cautionary tale by John Carter - 6/2/2026
I made a big mistake. When I bought my MacBook Air, I decided that 256GB storage would be enough because I would add a 512GB external drive, which would be enough.
Then I discovered that the operating system and applications consumed more than half of the 256GB storage.
Now the real problem is iCloud Drive. I wanted to be able to access all of the documents on my Mac mini from the Air. Guess what? That amount comes to almost 300GB!
Here’s the thing. Even with Optimized enabled for iCloud Drive, what is actually stored in the internal drive would be thumbnails when there isn’t enough space in storage to store all of the data. That means I cannot have iCloud enabled for documents on the Air because I would run out of storage on the Air just trying to enable Documents in iCloud. That actually happened!
Now add Photos to that mix, and iMessage messages, and Desktop, and whatever else you want to store in iCloud Drive.
I didn’t actually check for information like this before buying the Air, but now I know. 1TB internal storage is actually the minimum that I should have with any Apple computer, especially if you consider that the SSD should never exceed 50% capacity for best performance.
The next issue is with physical memory. My Mini has 32GB, and just sitting idle is it using 23GB. Holy Crap! I really needed 64GB to keep from slowing down my Mini.
All the reviews I have seen about how an Air with minimum memory and minimum storage is good enough for casual users is crap! And now more reviews are talking about minimum storage for Minis and MacBooks because adding external storage is cheaper. More crap! It all depends on how much total data you’re going to have in iCloud Drive, because that is how much internal storage you really need. Even with Optimized enabled, the chance of filling up the SSD is too great, and the performance will suffer.
The mistake was not really “buying too little internal storage.” The mistake was assuming external storage solves internal storage pressure. For many Apple workflows, it does not. Even with Optimize Mac Storage enabled, macOS decides what stays local and what gets evicted. The user does not get precise control.
External storage does not fully solve:
- iCloud Drive sync pressure
- System Data growth
- App support files
- Photos/iMessage/Mail caches
- OS update workspace (need 30GB minimum - for now)
- Swap files
- Local snapshots
- Anything macOS insists belongs in the user Library or system volume