Implement ability to back up crontab configuration

[d-Rickyy-b]

Cronjobs can be something quite important - especially because you can easily wipe your entire cronjobs with a singly typo... crontab -e for editing and crontab -r for removing...

crontab -l returns the cronjobs for the current user. Now we need some idea how and where to save that in the backup. Maybe on the root level.