The system is a bit complex, but a RAID1 plus a separate hard drive two volumes have been made to save important and insignificant data, respectively. The aluminum alloy shell is good. The plastic hard disk box is a little bad. It's easy to buckle.
The hardware cost performance is very high, but the software is finished. I've had a long way forward to the group. I thought of the unexpected functions. The F2-220 was very simple and suitable for people who had nothing to ask. The internal network rate was more than 70.