- Sparse bundles, like read/write disk images, can be encrypted
- Create a sparse bundle through the disk utility
- The sparse bundle's size on disk corresponds to its content size (which I like, but you may not like that it gives away some information about its insides)
- The change password function of Disk Utility (Images->Change Password) does not work through the GUI (the sparse bundle is greyed out and can not be selected). Use the command line instead:
hdiutil chpass /path/to/Encrypted.sparsebundle/
- The sparse bundle is supposed to be easier on Time Machine and other backups, because it is not one monolithic structure.
- Resizing the sparse bundle needs to also be done through the command line (GUI greyed out) and is done using
hdiutil resize -size 1.5g /path/to/bundle
Where 1.5g is the new size. It will ask you for the password.