Have you noticed that your Mac is starting to run out of space? Are backups taking forever, or that “disk almost full” alerts appearing without warning?
Don’t panic! The culprit is often an accumulation of large files forgotten over time. 4K videos, archives, duplicates, temporary system files… they quietly pile up and eat away at your SSD.
Fortunately, there are several simple methods to spot and effectively delete them.
Identify what takes up the most space
The first step is knowing where to look.
macOS includes a handy tool:
Apple menu > System Preferences > General > Storage.
A graph will appear, detailing the distribution of your disk space (applications, documents, photos, etc.).
Click on the “i” or “Manage” icon to view the large files automatically detected by the system.
In just a few minutes, you’ll know exactly which folders are filling up your disk.
Use the Finder’s advanced search
The Finder is also an excellent tool for tracking down large files.
Open a new window, then press Command + F.
Click on the “Type” menu and choose Other…, then check File size.
Enter a value, for example, “greater than 500 MB”.
The Finder will then display all files exceeding this size.
💡 Tip: You can combine several filters (file type, creation date, folder name, etc.) to refine the search.
Safely delete unnecessary files
Once the files have been identified, sort them.
- Old videos and editing projects can weigh several tens of gigabytes.
- The .zip archives and .dmg installation files are often forgotten after use.
- The downloaded documents and duplicate photos deserve a little cleaning up.
Remember to empty the Recycle Bin once you have finished sorting, otherwise the space will not actually be freed up.
Clean up with a dedicated tool
If you prefer a more automated solution, several utilities can scan your disk and identify large files in minutes.
Software specializing in this type of task offers a graphical visualization of the storage, which is useful for spotting the largest areas of the disk.
With a single click, you can delete or move bulky files without risking the deletion of important system components.
Move large files to an external drive
To avoid filling up your internal drive, consider moving large files to an external hard drive or the cloud.
External USB-C SSDs now offer excellent transfer speeds, perfect for storing videos, RAW photos, or professional archives. You can also enable the Optimize iCloud Storage
feature: macOS will keep only recent files locally and move older ones to iCloud Drive.
Check system files and hidden caches
Some system folders contain large temporary files, logs, and caches.
To view them, open Finder and click Go > Go To Folder…, then enter:
~/Library/Caches/
You can delete the contents of subfolders (without deleting the folders themselves).
⚠️ However, avoid touching system files you don’t recognize.
If you prefer to play it safe, use a cleanup tool that automatically filters out risky files.
Control disk space via the Terminal
For more experienced users, the Terminal offers a useful command to quickly visualize free space:
df -h /
You will see how much space is occupied and how much remains available.
Another command,
sudo du -h -d 1 /
allows you to see the largest folders at the root of the disk — ideal for targeting directories to clean up.
By combining this cleanup with good organization (iCloud, external drive, regular backup), your Mac will remain fast, smooth, and ready for future macOS updates.
Preventing saturation: archiving strategy and maintenance
Beyond occasional cleanup, adopt a sustainable archiving and maintenance strategy to prevent disk space from refilling. Implement simple rules: keep completed projects in a dedicated folder, compress rarely accessed files, and encrypt them if necessary for security. Consider defining a retention policy (for example: keep two years’ worth of active projects, archive the rest), and automate archiving with scheduled tasks that move or compress older files to an archive storage location. Using checksums or integrity mechanisms helps verify that archives are not corrupted during transfer or long-term storage.
Complement this with regular monitoring: enable threshold alerts, generate periodic reports on user directory growth, and apply quotas or automatic purging rules for temporary folders. For business environments or large volumes of media, document an archiving workflow (who archives, when, and where) and prioritize incremental backups to reduce storage requirements while maintaining a history. Finally, integrate controls over metadata (dates, size, type) to prioritize files for archiving, and consider selective synchronization when using multiple media to avoid redundant copies and optimize the use of the internal SSD.
