Code script for performing daily backups of the database

[jo-elimu]

Description

• Add script (crontab) to each server for running a database backup script once every 24 hours.
• Include code for deleting backups older than 30 days
• Add script for downloading backups from the server to a local computer

See related docs at https://github.com/elimu-ai/webapp/blob/main/src/main/config/DEPLOY.md#backup-database

Why?

To preserve data in case of server outage.

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