backup-pod.yaml

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: backup-bin
  namespace: {{namespace}}
data:
  backup.sh: |
    tgtname="{{backup_tgt}}-full-$(date +%F_%H%M%S).tar.xz"
    srcdir="/mnt/backup/sources"
    tgtdir="/mnt/backup/target"
    bsize=$(du -abd0 $srcdir | awk '{print $1;}')
    echo "Target backup file name is: '$tgtname'"
    tar -C $srcdir -cf - . | pv -s ${bsize} | xz -zcT0 > $tgtdir/$tgtname
    echo "Backup file '$tgtname' has been created."

  restore.sh: |
    srcdir="/mnt/backup/target"
    tgtdir="/mnt/backup/sources"
    
    cd $srcdir
    echo "Select backup file (by a number):"; 
    cnt=1; for c in $(ls); do if [ -f $c ]; then echo "  $cnt => $c"; cnt=$((cnt+1)); fi; done
    read -p "Selected file: " slf
    
    if [ -z "$slf" ]; then
      echo "File is not selected. "
      echo "Exitting"
      exit 223
    fi

    selected=""
    cnt=1; 
    for c in $(ls); do if [ -f $c ]; then
      if [ "$cnt" == "$slf" ]; then
        selected=$c
        break
      fi
      cnt=$((cnt+1))
    fi; done

    if [ -z "$selected" ]; then
      echo "Item '$slf' does not exist in the list."
      echo "Exiting"
      exit 223
    fi

    echo ""
    echo "Selected file is '$selected'. "
    echo ""
    echo "After continue, all current data will be deleted and will be replaced with the backup."
    read -p "Really to continue? (y/...): " cntx

    [ "$cntx" == "y" ] || exit 2231

    srcname=$selected
    bsize=$(ls -l $srcdir/$srcname | awk '{print $5;}')
    
    cd $tgtdir
    for c in $(ls); do rm -r $c/*; done
    pv -s $bsize ${srcdir}/${srcname} | xz -dc | tar -C $tgtdir -x

---
apiVersion: v1
kind: Pod
metadata:
  name: backup
  namespace: {{namespace}}
  labels: 
    app: backup
spec:
  containers:
    - name: tech
      image: alpine:3.15
      command: ["/bin/sh", "-c", "apk add mc bash xz bzip2 brotli pv && sleep 3600000"]
      volumeMounts:
        - name: hass-config-dir
          mountPath: /mnt/backup/sources/hass-config-dir
        - name: hass-database
          mountPath: /mnt/backup/sources/hass-database
        - name: mosquitto-data
          mountPath: /mnt/backup/sources/mosquitto-data
        - name: backup-dir
          mountPath: /mnt/backup/target
        - name: backup-bin
          mountPath: /bb
  volumes:
    - name: hass-config-dir
      persistentVolumeClaim:
        claimName: hass-config
    - name: hass-database
      persistentVolumeClaim:
        claimName: hass-database
    - name: mosquitto-data
      persistentVolumeClaim:
        claimName: mosquitto-data
    - name: backup-dir
      hostPath:
        path: /media/data1/backup/{{backup_tgt}}
    - name: backup-bin
      configMap:
        name: backup-bin