Why image "from Folder" rather than from the device? Because it creates a cleaner image (files all defragmented, etc) but preserves everything that matters (i.e. Once it's finished, choose Images > Scan Image for Restore, and have that process the newly-created image. In the save dialog, make sure Image Format is set to Compressed, and it's best to save it somewhere local (and copy it to the NAS afterward). In my experience, the best way to image an HFS+ volume is to mount it (note: don't try to image the volume you're running from at the time), open Disk Utility, choose File menu > New Image > Image from Folder, and select the top level of the volume as the "folder" to image. There's also a fixed-size read-write format, and a read-only (uncompressed) format, which'll store the same thing, but take up more space for no good reason.Īll the versions you mention will be in HFS+ (aka Mac OS Extended) format. which is pretty irrelevant for archived systems.
The sparse formats are useful for when you want the image to be able to expand later, when you add to them.
For archival images, I'd use the "compressed" format (which I think you'd consider "fixed", but it's one of a number of fixed-size formats).
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