Securing sensitive data from access by others, and safeguarding it from loss of damage, is common. Solutions range from encrypted images to specialist external disks.
disk image
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.
So many different types, from read-only disk image .dmg files, to sparse bundles and DVD/CD-R masters. Which to use, and how to create them?
Disk Utility can’t image APFS volumes, and normally returns an error if you try to image a container. Here’s the workaround.
Spundle 1.1 adds creation of encrypted sparse bundles, changing their band size, and more.
Saves you from having to learn how to use hdiutil, and supports 6 different file systems and custom band sizes.
An efficient means of storage with many uses, but riddled with bugs and shortcomings. Explains how to compact and resize them, and more.
Tests bring some surprises, with encrypted sparse bundles looking resilient to small amounts of corruption.
If you opt for ‘Mac-only’ format, isn’t that sufficient to preserve everything you need in an archive?
Contains binary data on the last integrity check made using fsck on a disk image. Can be deleted to enable some images to be mounted.
The Eclectic Light Company 