What you need to know about the HFS+ file system, so you can understand error reports and how to repair it using Disk Utility and other tools.
HFS+
What you need to know about disk formatting using the GUID Partition Table (GPT) to understand its problems and how to repair it.
How to store a 400 GB sparse bundle on a volume which only has 200 GB free space – provided that you don’t actually use the space that isn’t there.
How to hide text so that it can’t be searched or analysed, and how file naming almost brought APFS down.
Time Machine has been using snapshots since High Sierra. How can it then use them to make backups to APFS volumes in Big Sur?
Important update for all users, which addresses several bugs in setting the maximum size of sparse bundles.
How to set the total size, and band size, for your sparse bundles, with calculation of the critical band size.
This can now be incorporated into your own scripts, to check the integrity of important files automatically.
Time Machine can’t make backups to a disk formatted in APFS. Oh yes it can – and here’s how you can do it too.
Is it better to make sparse bundles ‘snug’, sizing them so that they don’t have as much free space? What if you then need to resize them?
The Eclectic Light Company 