How to reduce System Data storage on Mac after resetting?

How can I reduce my System Data storage? It's taking up 173 GB, and I've tried resetting my laptop, but it doesn't change much.

MacBook Air 13″, macOS 15.3

Posted on Feb 2, 2026 1:15 PM

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3 replies

Feb 4, 2026 3:18 AM in response to ermtheworm4

Two Cents here


Reducing System/Volume/Data is a common question. 


1 -  System data taking too much in MacOS Sono… - Apple Community


2 - Time Machine Local Snapshot won't delete - Apple Community


3 - Over 60% storage blocked by System Data - Apple Community


How to free up ‘System Data’ and other storage on your Mac from a fellow colleague  @ neuroanatomist


Use another application to see where space is being used  Storeograph  on the Apple Apps Store 


View APFS snapshots in Disk Utility on Mac


Suggest getting an External SSD Drive and start moving your Pictures, Videos, Music and any other large files you have control over, OFF the Internal drive and Onto the External


Understanding iCloud Drive from a well written User Tip from @ Richard.Taylor


➡️ There are  two effective ways to remedy this issue ⬅️


1. Quick Fix Actions:


 For Apple Silicon computers, use Disk Utility to erase a Mac.


For Apple Intel computers, use Disk Utility to erase an Intel-based Mac, then reinstall macOS.


Always make a Time Machine backup before proceeding.


 Migrate only the user account, not the entire system.


 Reinstall only the necessary applications from the Apple App Store or directly from the developers.


2 - Generally


When the user discovers this issue, it’s likely because the computer’s internal drive capacity is small, such as 256 GB


Unfortunately, the user’s storage needs may have increased since the computer was purchased.


To future-proof the computer, consider spending extra money upfront on a larger drive capacity and adding more unified RAM.


Note - On Apple Silicon and newer computers.


The SSD Drive and the Unified RAM are Soldered to the Logicboard and can not be upgraded.

How to reduce System Data storage on Mac after resetting?

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