Does it work with encrypted disk images?

Hallo,
I have a 10 GB fixed size image on my account and it is encrypted. It uses about 4,8 GB on the disk.
I would like to know if time machine is able to detect when changes are made inside such disk image,
if yes, if it is able to add just modified data or if it will copy all 4,8 GB file every time backup is made.
Thanks

If it is a standard encrypted disk image, Time Machine will copy the whole 4.8 GB every time.
But you can convert your disk image to a "SparseBundle" with this Terminal command:
hdiutil convert -format UDSB -imagekey sparse-band-size=32768 -encryption -o ~/Desktop/newimagename /path/to/olddisk_imagename (make sure that is all on one line)
That will copy your old disk image to a new one on the Desktop. A sparsebundle looks and behaves the same way as a regular .dmg. But the sparsebundle is actually a package that contains all of its data in 16MB bands. With any luck, your data changes will clump together in a few of these bands, and Time Machine will copy only those bands over rather than the whole shebang.

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Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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~~~~
   If you give a man enough rope, he'll claim he's tied up
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Hi:
With our upgrade to Lion a few weeks ago, we're now unable to create an encrypted disk image of any type using Disk Utility any more. This problem occurs on 3 different machines, and is reproducible whether one is using an internal HD or an external FW HD. We can successfully create nonencrypted disk images.
This is a duplicate post with all the details here: https://discussions.apple.com/message/18469359#18469359
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Format: Mac OS Encrypted (Journaled)
Encryption: 256-bit AES
Partitions: Single partition- Apple Partition Map
Image Format: read/write disk image
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Disk Utility Version 12.1.1 (353)

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Here are some screenshots of before and after I try to partition (after the resize):
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Does it work with encrypted disk images?

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