Sure! Here's an example cron job that will run the backup command every day at midnight:

Open a terminal window on your Debian system.
Type the command crontab -e to open the crontab file in your default text editor.
Add the following line to the end of the file:
0 0 * * * sudo rsync -aAXv --exclude={"/dev/","/proc/","/sys/","/tmp/","/run/","/mnt/","/media/*","/lost+found"} / /mnt/usb/backup/
Save and close the file. This will install the cron job.
This cron job will execute the backup command every day at midnight. You can modify the scheduling to match your needs by changing the values in the first four columns of the line (in order, minute, hour, day of month, month).

Keep in mind that you'll need to have permission to edit the crontab file, and that this example command assumes you've mounted the USB drive to /mnt/usb. Be sure to adjust the command to match your system configuration.
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