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+###### crontab setup:
+
+sudo crontab -e
+
+select your desired text editor
+
+then add this below line at the end of the crontab file
+
+0 0 * * SUN /usr/bin/sudo /home/arul/back-up-script/backup-server
+
+
+###### Explaination:
+
+* * * * *
+│ │ │ │ │
+│ │ │ │ └── Day of the week (0 - 6) (Sunday = 0)
+│ │ │ └──── Month (1 - 12)
+│ │ └────── Day of the month (1 - 31)
+│ └─────── Hour (0 - 23)
+└───────── Minute (0 - 59)
+
+
+
+0 0 * * SUN:
+
+    0 minute: The job runs at the 0th minute (on the hour).
+
+    0 hour: The job runs at midnight (00:00).
+
+    * day of the month: This means it can run on any day of the month (not restricted).
+
+    * month: This means it can run in any month.
+
+    SUN: The job runs only on Sundays (which are represented by 0 or SUN in cron).
+
+