On Nov 15, 2011, at 1:58 PM, Ben Kernan wrote:

> I can't seem to figure out how to change Time Machine's preferences... I 
> really don't want it doing a backup of my drive every hour, once a week would 
> be fine. BTW I am backing up to an 80 gig drive... Yea, I know I should get 
> something bigger, but I haven't gotten there yet. Just took the thing out of 
> storage today...
>  
> Ben Kernan:  24"I-Mac 2/2.8/700, graphite g-4 1gig/400/52, iPad 2/64/wifi, 
> iPhone 3g - Dedicated Mac user since 1990

If all you want is a weekly backup, then you'd be better advised to use Carbon 
Copy Cloner or SuperDuper and use it to do that. Once CCC of SD do the first 
clone/backup, it will do incremental backups on whatever schedule you choose. 
Either program also lets you specify what you do and don't want to backup. And 
you will have a bootable backup in case of a system crash. A good rule of thumb 
is to have a backup drive with at least as much storage capacity as the drive 
that's being backed up, BTW.

Time Machine does not create a bootable backup, although you can use it to 
restore all your files in case of a disaster requiring a complete nuke and pave 
reinstall of the OS. Time Machine's main value is that it gives you an 
hour-by-hour snapshot of all the data on your Mac. Which means that if you 
mistakenly deleted something at 1 p.m. and discovered it at 5 p.m., you could 
go into Time Machine, navigate back to the undeleted files at 12 p.m. and 
recover them. It's saved my bacon more than once since I started using it.

I find that having a bootable CCC daily backup on one external hard drive, and 
an hour-by-hour non-bootable Time Machine backup on another external hard drive 
(I use a 2 TB Time Machine) gives me all the backup I need. However, I also do 
regular backups on a third hard drive via CCC which I keep in a different 
location in case of fire, theft, earthquake, stupidity. YMMV.

Jim


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