Laptop Backups With anacron

“With cron, you schedule a job at a specific date and time. If
at that particular time the machine is down, the job just won’t run
(until the next time it’s scheduled). With anacron, you schedule a
job to run at specific intervals, for example, daily, weekly or
monthly. anacron will try to keep as closely to this schedule as
system uptime permits. If a job is supposed to run daily, but when
the computer is switched on the anacron daemon finds that it hasn’t
run in the last 24 hours, it will be run there and then.”

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