From personal experience I can certify…
  • not all clone utilities or techniques clone the Recovery Drive. The only one I have personally tested that successfully cloned the Recovery Drive was Carbon Copy Cloner. 👍There may be others but either I have not tested them or they did not when I last tested them.
  • the one time I attempted to install from a Recovery Drive when the Recovery Drive and the installed boot volume did not match, I had to erase the boot volume, use the RD to reinstall the previous OS X version, restore everything else from the Time Machine backup.😠
  • beta installers do NOT update the Recovery Drive (which is good in case you have to revert) 👈
  • upGRADE installers create or upgrade the Recovery Drive
  • upDATE installers seldom, if ever, update the Recovery Drive



If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein