CT wrote:
And it (TimeMachine) can be a life saver.
Not if your internal drive is not booting it isn't.
A clone is bootable in seconds and is as recent as the last saved update, then one can retrive files off the internal drive (if it's working) even get deleted files off a hard drive with Data Rescue, and either run the computer off the external drive clone (like if the internal drive is dead) or erase and reverse clone all their troubles away in about a hour or so.
TimeMachine is only a backup system, if one's boot drive fails to start because of hardware or software causes, it requires a lenghly fix either in hardware or in some cases software before a restore can occur.
Also since it's not bootable, one can't use a TM drive to use Data Rescue type software to recover data (even deleted) off the internal hard drives.
Clones are bootable, thus they can be checked out that they are functioning correctly to restore, TimeMacine can't do that so you have no idea if your data on the TM drive is going to restore, unless you take the effort to do so to a external drive and boot from it.
TimeMachine copies the same corruption problems that are occuring on the boot drive and if a TimeMachine drive is corrupt, god help you. At least with a non-booting clone I can read the files directly or even connect it to a PC and recover files.
Because I maintain my machines and software very well, I never really had any issues for over 20 years of using Mac's.
However I did have a boot hard drive suddenly fail on my PowerMac G5 Dual once, but I was up in 20 seconds on my bootable clone and making another one on a new internal drive.
TimeMachine/TC is better than nothing, but it's far from being robust and relaible and in the case of TC, quite expensive to replace and hard to restore with.