Add mongodb backup cron

[jinho-choi123]

Summary

Add Mongodb Backup script. Need to add to crontab on Host Machine.(Not inside docker container)

Tasks

• [x] #109
• [x] Add cleanup script

[jinho-choi123]

Added document to Zabo notion page. https://www.notion.so/sparcs/587229f240ee44bb916fb0cfc19b28f2?pvs=4 Currently using Host machine crontab. Need to further add the script to node-cron.