We recommend that for best data protection, you should make a backup every time you add files/folders or make changes to files in your Vaults. It is VERY IMPORTANT to backup your flash drive Vault data immediately after you change your password. Your password is linked to your Vaults, and in case you have to restore data from a Vault backup you will need to provide the password that was in effect at the time of the last backup. If you have never backed up the Vault data, there is no way to restore any data if your current Vault has become corrupted or the drive is lost or damaged beyond repair.