CONCLUSION:
8 TB of storage, excellent reliability, ultra-fast network access. Manageability through Windows (even XP is required). (After the NAS, what difference). And all at low prices.
I do not regret my choice.
Warning about the reliability after two and a half years:
The cooling fans are not of great quality and seizing after two years without no alarm points out.
The suite is inevitable: overheated hard drives, destruction surfchauffe the central disk.