definitely

you can't boot from a TM back-up. I clone every time I do a system update or 
major install. Restoring from a clone is much quicker than from TM, I think. 
It's certainly straightforward. Besides, remember the iPhoto fiasco of theSnow 
Leopard upgrade, which managed to wipe out TM photo backups?!

Ideal -- rotating clones (maybe two, alternating so you have this week's clone 
and last week's), TM, and back-up of TM disk. That might seem top-heavy but it 
has enough redundancy that things like the iPhoto thing wouldn't hit you too 
bad (actually, it would have if you didn't spot it within a fortnight).

I've lost too much data over the last 15 years not to take precautions.
On 11 Jan 2010, at 11:50, Russell Brown wrote:

> Is Time Machine sufficient, or should one also have a bootable clone of your 
> Mac HDD?

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