Take a snapshot of your MongoDB using shell script and upload to S3

mongo_dump.sh

#!/bin/bash

MONGO_DATABASE=""
APP=""

TIMESTAMP=`date +%F-%H%M`
MONGODUMP_PATH="/usr/bin/mongodump"
BACKUPS_DIR="/home/me/backups/$APP"
BACKUP_NAME="$APP-$TIMESTAMP"

S3_KEY=""
S3_SECRET=""
S3_BUCKET=""
AWS_PATH="/backups"

export LC_ALL=C
mkdir -p $BACKUPS_DIR
$MONGODUMP_PATH --db $MONGO_DATABASE -out $BACKUPS_DIR/$BACKUP_NAME

tar -zcvf $BACKUPS_DIR/$BACKUP_NAME.tgz $BACKUPS_DIR/$BACKUP_NAME
rm -rf $BACKUPS_DIR/$BACKUP_NAME

function uploadS3 {
  date=$(date +"%a, %d %b %Y %T %z")
  acl="x-amz-acl:public-read"
  content_type='application/x-compressed'
  string="PUT\n\n$content_type\n$date\n$acl\n/$S3_BUCKET$AWS_PATH/$BACKUP_NAME.tgz"
  signature=$(echo -en "${string}" | openssl sha1 -hmac "${S3_SECRET}" -binary | base64)
  curl -X PUT -T "$BACKUPS_DIR/$BACKUP_NAME.tgz" \
    -H "Host: $S3_BUCKET.s3.amazonaws.com" \
    -H "Date: $date" \
    -H "Content-Type: $content_type" \
    -H "$acl" \
    -H "Authorization: AWS ${S3_KEY}:$signature" \
    "https://$S3_BUCKET.s3.amazonaws.com$AWS_PATH/$BACKUP_NAME.tgz"
}

uploadS3