- There are multiple hidden partitions and volumes in Catalina, Monterey, and Ventura that are required to boot the system. One of these partitions must be on the internal drive because, among other things, it is necessary for the system to "see" the external volumes. Even Mike Bombich, the developer of Carbon Copy Cloner, no longer recommends external boot volumes. The Data volume on a clone, can be used as an alternative to Time Machine backup to recover that part of a system.
- Catalina, Monterey, and Ventura can ONLY be installed on a drive formatted APFS.
- An alternative to the Recovery Drive Install is to create a bootable thumb drive installer especially if your internet connection is slow. (It is the same as the Recovery Drive installer, but does not require an Internet connection for the actual installation.)
- Be aware that some Microsoft and Adobe products may require being uninstalled on your old system a reinstalled on the upgraded system.
- 32 bit applications will not run in Monterey
If we knew what it was we were doing, it wouldn't be called research, would it?
— Albert Einstein
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