Does anyone here know how to make a scheduled backup procedure using the cron file?

Please tell me as soon as possible.

Thanks in advance.

It's pretty straightforward. You simply write a bash script (or whatever shell flavor you like) to do the backups (either tar or dar commands). Then create a scheduled crontab event using:

I'm assuming you know how to input the lines in crontab. Here's an example from mine:

This line runs my backup-full.sh script every hour at 5 minutes past the hour. Your scripts can be as simple or complicated as you like. Mine are a little complicated in that they look for hotplug events to migrate my backups and do checks to see when the last backup was performed and such. That's why I installed them to run every hour since they are on my laptop and it's not always powered on. So I let the scripts do all the checking instead of relying on my computer being powered on at the appropriate times. A place to check for some simple backup scripts is: http://www.linux-backup.net

Hope this helps.