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Hello @Lazza,
i added 2 Hooks for Fuji.

Why?
The first Hook:
a commonly used forensic tool called X-Ways Forensics does not support the UDZO image format, only UDRW is supported. Therefore I have added the option to select it here. Leier I was not able to calculate the effect on “Free Space”. With a volume (APFS -100MB with 10 MB used memory) the .dmg was then approx. 1.2 GB in size.
You are also welcome to write to X-Ways Forensics (mail@x-ways.com) and ask for additions. You can also point out the compression. (The UDZO Image is an UDIF zlib-compressed read-only image).
The second Hook:
After creating the image, Fuji can also delete the temporary image (.sparsefile) if you like. Since it is optional, you can have it deleted immediately.
the values of the hooks are also available on the overview page.


or - here standard
So it could maybe the version 1.2
I am pleased to hear from you.
By the way, the backup here was successfully performed with a MacBook Pro (M1) with MacOS 15.3.2.