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#!/bin/bash
DUMPPATH=/home/user/dumps
MONGODBNAME=my_db
DAY=`/bin/date +%Y%m%d`

mongodump -d $MONGODBNAME -o $DUMPPATH/mongo_$DAY
cd $DUMPPATH/mongo_$DAY
tar -cvzf "$DUMPPATH/mongo_$DAY.tar" $MONGODBNAME
cd $DUMPPATH
rm -rf $DUMPPATH/mongo_$DAY

1. Set appropriate permissions to the file

$ chmod 755 mongobackup


Then add the following entry to your crontab list
-------------------------------
@daily /home/user/mongobackup
-------------------------------


@daily means everyday at midnight