I know we've had various threads about keeping "periodic" jobs running on a portable. The usual solution is to modify the time in your crontab; which certainly works, but has the same potential limitation (your computer has to be on for the jobs to run). But there's another tool, called anacron, that's been available on Linux for quite a while. Anacron is a better cron because it is not time-of-day dependent. It sets an execution interval for a task; but if the computer isn't running at the right time, anacron makes sure that task will run soon after the computer is powered up. Basically anacron checks job execution time against a minimum selected interval, rather than a set time of day. What's neat, though, is that there's a package available for download from Apple. All you do is install the package, and it automatically takes your cron jobs and turns them over to anacron. No tweaking is necessary (although you certainly still can play around with it if you want to). http://www.apple.com/downloads/macosx/unix_open_source/anacron.html Anacron is also available via fink, but this seems like a better way to do it because of the autoconfiguration.