message: Add functionality to save local backup
  (for
diff: </mat-icon>
  </button>
  - <button mat-fab class="backupButton" color="primary"
  + <button mat-fab class="backupButton" color="primary" disabled
  aria-label="Button to restore local backup" matTooltip="{{ 'RESTORE_BACKUP_TOOLTIP' | translate }}"
  matTooltipPosition="above">
  <mat-icon>
  