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Why did that macOS upgrade take so much space?

Why upgrading to Tahoe shouldn’t consume the last free space on your Mac’s SSD, and once it has settled should use little more than currently. How to clear out old snapshots and reduce System Data.

October 2, 2025 Macs, Technology

Save space on the internal SSD by adding another volume

T T Read More

If you’ve got large files like Virtual Machines or media libraries on the Data volume on your Mac’s internal SSD, use this method to keep the size of its snapshots smaller.

May 28, 2025 Macs, Technology

What isn’t backed up?

Backups don’t include everything. Here are details of those items excluded from Time Machine backups, and why they’re excluded.

May 2, 2025 Macs, Technology

Last Week on My Mac: Giving a fsck

What disk checks are made in Safe mode? How are they different from those run during normal startup? If Disk Utility is to be our only APFS repair tool, shouldn’t have more and better features?

March 23, 2025 Macs, Technology

What is System Data in Storage Settings?

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The bar chart in Storage Settings shows most of your startup volume is full of System Data. What does it mean, and what use is it? Is its measure of used and free space accurate?

February 11, 2025 Macs, Technology

Start planning your Mac’s Spring clean

Spring will soon be upon us, and it’s time to plan our Spring software housekeeping to clear out the junk that has accumulated over the winter. How to go about it.

February 6, 2025 Macs, Technology

Why use APFS?

Deciding which file system to use for hard disks can be difficult. Here are the advantages and disadvantages explained in detail, for HFS+ and APFS.

January 9, 2025 Macs, Technology

Why all the snapshots?

How snapshots are created from a volume in around 0.01 second, why they will grow in size over time, how they can only be of complete volumes, and can’t be edited.

January 7, 2025 Macs, Technology

Planning complex Time Machine backups for efficiency

Understand how TM backs up and how snapshots work to minimise the size of local snapshots and backups, and the time they take. How to ensure files in iCloud Drive are backed up properly.

October 28, 2024 Macs, Technology

APFS incompatibilities and how to live with them

When do sparse files explode to full size, and how could you preserve them in transit? Can you copy clones or snapshots? How to preserve extended attributes?

October 8, 2024 Macs, Technology

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