Add BackupAndRestore info

doc/BackupAndRestore.md

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+# Backup Architecture details
+
+![](backup.svg)
+
+* we use restic to produce small & encrypted backups
+* backup is scheduled at `schedule: "10 23 * * *"`
+* Cloud stores files on `/var/jira`, these files are backuped. If you create a jira xml backup located in /var/jira this file will also be backed up.
+* postgres db is backed up as pgdump
+
+## Manual init the restic repository for the first time
+
+1. Scale backup-restore deployment up:   
+   `kubectl scale deployment backup-restore --replicas=1`
+1. exec into pod and execute restore pod   
+   `kubectl exec -it backup-restore -- /usr/local/bin/init.sh`
+1. Scale backup-restore deployment down:   
+  `kubectl scale deployment backup-restore --replicas=0`
+
+
+
+## Manual backup the restic repository for the first time
+
+1. Scale Cloud deployment down:   
+  `kubectl scale deployment cloud-deployment --replicas=0`
+1. Scale backup-restore deployment up:   
+   `kubectl scale deployment backup-restore --replicas=1`
+1. exec into pod and execute restore pod   
+   `kubectl exec -it backup-restore -- /usr/local/bin/backup.sh`
+1. Scale backup-restore deployment down:   
+  `kubectl scale deployment backup-restore --replicas=0`
+1. Scale Cloud deployment up:   
+   `kubectl scale deployment cloud-deployment --replicas=1`
+
+
+## Manual restore
+
+1. Scale Cloud deployment down:   
+  `kubectl scale deployment cloud-deployment --replicas=0`
+2. Scale backup-restore deployment up:   
+   `kubectl scale deployment backup-restore --replicas=1`
+3. exec into pod and execute restore pod   
+   `kubectl exec -it backup-restore -- /usr/local/bin/restore.sh`
+4. Scale backup-restore deployment down:   
+  `kubectl scale deployment backup-restore --replicas=0`
+5. Scale Cloud deployment up:   
+   `kubectl scale deployment cloud-deployment --replicas=1`