I do the same as Mick. Time machine is OK for specific file or folder restores but Super Duper gives you a bootable backup. If you subscribe it also gives you an incremental backup. Excellent in both cases.
Mark, it is perfectly possible to restore a machine from an install CD or DVD in conjunction with Time Machine but if you have a recent clone, it's a lot easier. Also, (and this is more important if your machine is used for any paid work or time sensitive stuff) if your machine needs to be away for repair for a while, you could plug your clone into a second (borrowed?) machine, make it start from that and carry on with your work. When your machine gets back from the hospital, you just clone back from your external drive. This has no effect on the contents of the temporary machine.
ditto
I use Superduper to maintain a bootable back every evening at 7pm, and at random tine intervals to a USB connected external disk
I also have Time Machine backing up the main drive to another internal drive.
Great - thank-you - I will just have to get on with it now.
Does the back up HD need to be a certain proportion bigger? For example I wish to put 212GB onto it so will 250 GB be enough?
Speaking of bootable drives I have a Western Digital My Book 500g which has a cloned version of my main hard drive on one of its partitions, but this is not recognised by the start up disc preferences. Is this a peculiarity of MY Book HDs or is there some tweak I can give it to behave?
Lionel, I don't think the My Book 500g has the Oxford 911 or 924 chipset. This is the chipset that is required to enable a drive to be bootable. I fell into the same trap with a Formac drive a little while back.
Replying to Mick, The My Book is connecte to my Intel iMac running Os !0.5.6 and has 3 partitions one of which contais a Surer Duper Clone of the Main HD