How to backup the cronjobs of all users on Debian and Ubuntu Linux?

The cronjobs (crontabs) for all system users in Debian and Ubuntu Linux are stored in the directory /var/spool/cron/crontabs. To make a backup with tar, use this command:

tar pcfz /root/user_crontabs.tar.gz /var/spool/cron/crontabs

The backup file user_crontabs.tar.gz is be stored in the /root/ folder.

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