Duetto wrote:
Dear Michel,
thank you so much for pointing out this alternative solution, which I plan to try out. Can you be so kind though to advise, which external hard drives you are using for that purpose, respectively which ones you recommend/worked best for you? Apparently there are a lot of hard drives out there from which you cannot start-up/boot.
And unfortunately there seems to be no way to run 10.6.8 on a partition of a brand new 3TB fusion drive iMac with El Capitan, which I also have. In the past I would always backup my Macbook (with 10.6.8) on a partition of my old iMac, where I always had the latest OS on one partition (and a CCC clone of my Macbook as backup on a second partition, preserving 10.6.8).
Thank you again for your post! Kind regards, A.
All hard drives can be made bootable.
Same goes for SSDs and high speed read/write USB flash drives.
It is a function of the disk setup process and the boot code that is in the OS software installation process.
There are NO "special" drives that are bootable.
WIth any new Mac, you cannot run an older OS X version that has not been originally installed.
If you want to run Snow Leopard on your new Mac, there is a workaround that involves using virtual environment software, like either purchasing Parallels Desktop, VMWare Fusion or the free, open source Virtualbox.
Plus you need to use Snow Leopard Server that is still available on disc from Apple for $20. You need to call Apple at 1-800- MYAPPLE to get this version.
You install one of these virtual environments on to your Mac, launch it. Then you insert the Snow Leopard Server disc into your optical drive and install Snow Leopard Server into the virtual enviroment. Once Snow Leopard Server installs and launches, you can reinstall all of your OS X Snow Leopard versions of all your third party software.
You can install all of this on your Mac's internal hard drive or if you used CarbonCopyCloner to clone your current system to an external hard drive, you can install all of this to an external drive, too!
As far as hard drives go, I would stick with purchasing online OWC's Mercury Pro Drives (macsales.com).
Get either a large capacity SSD in a enclosure or standard large capacity, external hard drive in an enclosure.
Not knowing what Mac you have, get a drive that has both Thunderbolt and USB 3 connections.
Having extra, redundant connections for an external hard drive is always better.
Also, before purchasing, call them about your Mac model and any of their drives with Thunderbolt connections.
Some users here mentioned that there were issues with the Thunderbolt connection and new Macs with El Capitán.
Call them, tell them your Macs specs and let them recommend the Mecury Pro drive that will work with your Mac.
Ask them if there were any issues with the Thunderbolt enclosures.
Good Luck!