A script to help me export the entries from my main Nightscout DB to a serverless instance for archiving.

nightscout-backup.sh

##############################
## NIGHTSCOUT BACKUP SCRIPT ##
##############################

# I'm using an Atlas DB called 'nightscout-cluster' at the time of writing.
# This DB is limited to 500MB so every now and then,
# I want pump its records over to 'serverlessnightscout' (a serverless Atlas DB), which is unlimited.

# If Nightscout ever starts supporting serverless databases, I can just update the
# connectionstring in Heroku, and start using the unlimited one.

# To run this script, start a fresh mongo docker container like so: 
docker run -d --name nightscout-backup mongo

# Connect to the container's shell:
docker exec -it nightscout-backup bash

# Then run the following commands: (update with your own values)
export BACKUP_DESTINATION=serverlessnightscout.abc123.mongodb.net
export BACKUP_SOURCE=nightscout-cluster.abc123.mongodb.net
export USERNAME=heroku
export PASSWORD=see-password-manager

# Dump Nightscout DB from SOURCE Atlas server
mongodump --out /backups mongodb+srv://$USERNAME:$PASSWORD@$BACKUP_SOURCE/nightscout?retryWrites=true&w=majority

# Restore the Nightscout DB to DESTINATION Atlas server (serverless)
mongorestore --dir=/backups mongodb+srv://$USERNAME:$PASSWORD@$BACKUP_DESTINATION/?retryWrites=true&w=majority

# Exit docker container
exit

# Remove the docker container when you're done:
docker rm nightscout-backup

If you don't want to run this on your own Docker instance, you can have GitHub do it for you: https://github.com/nielsmaerten/nightscout-archiver