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I want a backup task to run once a week.

The computer I want to do this is a laptop, that is often off / sleeping. I would like the task to run when the computer wakes, if the computer was asleep when it was supposed to run.

Otherwise the chance of anything actually getting backed up is pretty slim.

Is there an application or MacOSX feature that does this?

My understanding of cron jobs is that if the computer is not on when it's supposed to run they will not get run on awakening, so that doesn't look like what I want.

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up vote 4 down vote accepted

There are various mechanisms in Mac OS X to do scheduled tasks. They take a little bit of effort to configure, but this page explains it and has links to more info. The 'at' service, which was a bit easier to use, is deprecated as it wastes battery.

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"in Mac OS X v10.4 and later, the job executes automatically when the computer wakes up" … wonderful sir, have an upvote and a tick box. I think the documentation I was looking at was pre 10.4 :S – SCdF Nov 11 '10 at 12:27

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