How to make sure my files never be lost?

  1. DO NOT delete, rename or move the folder .galleryvault_DoNotDelete_*** or any file in it.   
  2. If you are using some cleaning tools, make sure that they will not delete any files of Gallery Vault
  3. If you want to factory reset your device or change a new SD card, backup your files first (Refer to "How to backup and restore").