While images are nice, for CP/M there is another alternative that may be more widely useful and easier, although it's less historically accurate. That is just to copy the files over to MS-DOS disks, where they can then exist in folders on a modern hard drive or be put on CDs or DVDs. I can really see no advantage to a strict "image", as long as one has the files. The issue that this leaves out is the system tracks, but that is easily dealt with: Runs "SYSGEN", exit, and then do a "SAVE 34 SYSTEM.COM" and you have the system tracks as a disk file in a format that is easily restored simply using SYSGEN. This method also has some actual advantages, in terms of being able to actually use the software with a CP/M emulator on a PC. Since I'm not aware of any CP/M programs that did copy protection or any other type of manipulation that would require an exact disk image, I don't really see the drawback of this approach.