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This script backs up MongoDB database and stores it in /opt/mongoyedek folder. If there are multiple backups, it keeps the newest 2 and deletes the others.
To prevent filling the server’s disk in case old backups are too many or not deleted, either define a separate disk space for the address where you will take backups or also consider moving backups to a place outside the server.
Edit the ‘Ip,Username,Password’ fields specified for the script according to your own Db information. 
sudo vi mongodump.sh

#!/bin/bash

IP_ADDRESS="{Ip}"
USERNAME="{Username}"
PASSWORD="{Password}"
PORT="25080"
BACKUP_DIR="/opt/mongoyedek"

# Check and Create Backup Folder
if [ ! -d "$BACKUP_DIR" ]; then
    sudo mkdir -p "$BACKUP_DIR"
    sudo chown $USER:$USER "$BACKUP_DIR"
fi

# Determine file name and add number
DATE=$(date +%F)  
BASE_NAME="apinizer-backup-${DATE}"
index=0

# Check existing files within the same day and determine an appropriate number
while [ -e "${BACKUP_DIR}/${BASE_NAME}-${index}.archive" ]; do
    index=$((index + 1))
done

BACKUP_PATH="${BACKUP_DIR}/${BASE_NAME}-${index}.archive"

# Get file names to keep last 2 files and delete
files_to_keep=$(ls -lt "$BACKUP_DIR"/*.archive | head -n 2 | awk '{print $9}')
all_files=$(ls -lt "$BACKUP_DIR"/*.archive | awk '{print $9}')
files_to_delete=$(comm -23 <(echo "$all_files" | sort) <(echo "$files_to_keep" | sort))

for file in $files_to_delete; do
    echo "Deleting: $file"
    sudo rm -f "$file"
done


sudo mongodump --host "$IP_ADDRESS" --port="$PORT" --username="$USERNAME" --password="$PASSWORD" --authenticationDatabase=admin --gzip --archive="$BACKUP_PATH"

echo "Backup completed: $BACKUP_PATH"

sudo chmod +x mongodump.sh
./mongodump.sh
If you wish, you can ensure the script runs at a specific time or time period. Cron can be used for this. 
sudo crontab -e
Add the line below to the opened file. 
59 23 1 * * /path/mongodump.sh
In example usage, the script will run on the 1st day of each month at 23:59.