It is based on Linux and with the possibility of SSH access. It is therefore possible for example to customize the copy script to usb nas (with the copy button on the front). Otherwise, the web interface is great. Flow rates are monstrous (my network is gigabit cat6 on) and I am several hundred MB / s. The services available cover in my opinion every need (even mail server!) The backup time is very reminiscent at time Apple machine. By safeguarding against differential does not appear, it's full every time, thus providing a large external drive USB3 more time for backup and for the backup in general. Only downside, the photo application that is a bit simplistic. I desperately seeking a way to rename photos using exif their loading in the app picture because I sometimes have pictures from different devices but the same brand and therefore with the same name the images. I think with the possibility of customizing the NAS it will happen. Beware though, the customization disappear when software updates Nas. Remember to save them!