Add documentation for online backups/restoring after disaster

deployment/volumes/neo4j-online-backup/README.md

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+# Backup (online)
+
+## Online backups are only avaible with a Neo4j Enterprise and a license, see https://neo4j.com/licensing/ for the different licenses available
+
+This tutorial explains how to carry out an online backup of your Neo4J
+database in a kubernetes cluster.
+
+One of the benefits of doing an online backup is that the Neo4j database does not need to be stopped, so there is no downtime. Read [the docs](https://neo4j.com/docs/operations-manual/current/backup/performing/)
+
+To use Neo4j Enterprise you must add this line to your configmap, if using, or your deployment `nitro-neo4j` env.
+
+```
+NEO4J_ACCEPT_LICENSE_AGREEMENT: "yes"
+```
+## Create a Backup in Kubernetes
+
+```sh
+# Backup the database with one command, this will get the nitro-neo4j pod, ssh into it, and run the backup command
+kubectl -n=human-connection exec -it $(kubectl -n=human-connection get pods | grep nitro-neo4j | awk '{ print $1 }') -- neo4j-admin backup --backup-dir=/var/lib/neo4j --name=neo4j-backup
+# Download the file from the pod to your computer.
+kubectl cp human-connection/$(kubectl -n=human-connection get pods | grep nitro-neo4j | awk '{ print $1 }'):/var/lib/neo4j/neo4j-backup ./neo4j-backup/
+```
+
+You should now have a backup of the database locally. If you want, you can simulate disaster recovery by sshing into the nitro-neo4j pod, deleting all data and restoring from backup
+
+## Disaster where database data is gone somehow
+
+```sh
+kubectl -n=human-connection exec -it $(kubectl -n=human-connection get pods | grep nitro-neo4j |awk '{ print $1 }') bash
+# Enter cypher-shell
+cypher-shell
+# Delete all data
+> MATCH (n) DETACH DELETE (n);
+
+exit
+```
+
+## Restore a backup in Kubernetes 
+
+Restoration must be done while the database is not running, see [our docs](https://docs.human-connection.org/human-connection/deployment/volumes/neo4j-offline-backup#stop-and-restart-neo-4-j-database-in-kubernetes) for how to stop the database, but keep the container running
+
+After, you have stopped the database, and have the pod running, you can restore the database by running these commands:
+
+```sh
+kubectl --namespace=human-connection get pods
+# Copy the ID of the pod running Neo4J.
+# Then upload your local backup to the pod. Note that once the pod gets deleted
+# e.g. if you change the deployment, the backup file is gone with it.
+kubectl cp ./neo4j-backup/ human-connection/<POD-ID>:/root/
+kubectl --namespace=human-connection exec -it <POD-ID> bash
+# Once you're in the pod restore the backup and overwrite the default database
+# called `graph.db` with `--force`.
+# This will delete all existing data in database `graph.db`!
+neo4j-admin restore --from=/root/neo4j-backup --force
+exit
+```
+Revert your changes to deployment `nitro-neo4j` which will restart the database.