bash script to backup LUKS headers and dumpfiles of selected volumes (cryptsetup luksDump and luksHeaderBackup)

do_cryptsetup_luksDump_luksHeaderBackup.sh

#!/bin/bash

declare -A arrayVolumes
# HOWTO: Enter new row with names of the volumes how you want your files to be named and their uuids
# You can find UUIDs via lsblk -o NAME,UUID. Use UUID of the /dev/sdx1 encrypted volume not the already mounted luks-xxx mapper
arrayVolumes[somevolume]="0e7d8c5e-fe46-4c24-bdfe-041e28e2055b"
arrayVolumes[anothervolume]="5e819f85-f283-41af-a774-6debaa4fa740"

listOfVolumes=$( echo "${!arrayVolumes[@]}" )

if (whiptail --title "Backup of LUKS headers" --yesno "Do you want to backup to the current folder LUKS header backups of these volumes? ${listOfVolumes} ?" 8 70); then
  echo "Trying to backup LUKS headers and luksDumps of volumes that are connected"
else
  exit 1 || return 1
fi

for volumeName in "${!arrayVolumes[@]}"; do
  echo "Looking if volume named ${volumeName} with UUID ${arrayVolumes[$volumeName]} is currently connected"
  if [ -b /dev/disk/by-uuid/${arrayVolumes[$volumeName]} ] ; then
    echo "[OK] Volume with UUID ${arrayVolumes[$volumeName]} was found, performing LUKS header backup of ${volumeName}"
    cryptsetup luksDump /dev/disk/by-uuid/${arrayVolumes[$volumeName]} > ${volumeName}.luksDump
    cryptsetup luksHeaderBackup /dev/disk/by-uuid/${arrayVolumes[$volumeName]} --header-backup-file ${volumeName}.luksheader
  fi
done

echo "Volumes from the list that were currently connected have their LUKS headers backed up. Done."