Can use WISEGIGA for data backup with an external HDD. You can format external HDD for using to Linux. The AP mode is wired to the Internet, providing Internet services to other Client WISEGIGA Wireless or Wireless LAN PC and other wireless LAN devices. Back-up of all folders provides backup for user folder, shared folder, website, and all the mail. Selected folder backup provides backup for selected items among user folder, shared folder, website, and mails. For the backup schedule, either backup for each time the designated time has passed or backup for a designated time of day may be used.. The admin user can log-in using a root at Windows Explorer to access USB HDD.