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4b7609791b
Split the cron file so that the hourly, daily, weekly, and monthly
zfs automatic snapshots still happen even if the system is offline
temporarily during the scheduled event, such as during a reboot.
On Debian systems, if anacron is installed, then it is used to run
the /etc/cron.{hourly,daily,weekly,monthly} directories, but not
the /etc/cron.d directory. This means that /etc/cron.d jobs are not
run if the system is offline when crond would usually invoke them.
An alternative implementation of the zfs-auto-snapshot service for Linux. This program is a posixly correct bourne shell script. It depends only on the zfs utilities and cron, and can run in the dash shell.