This is a highly compact (about the size of a TV remote), very low power usage (only 15W max.) computer.  I got it with the max 8GB RAM for this Celeron J4125 Processor and it came with Windows 10 Pro at the time. (Aug. 2021)  It's not meant to be a powerhouse.  It works well for a basic home file server and 2nd computer that runs better than a Virtual Machine.  I could have used 4GB RAM, but 8GB allows me to actually use it as a 2nd computer without needing to swap memory to the SSD.It has about the same performance as an old Surface Pro 3 tablet with an Intel i5-4300 with 8GB.  It would probably run a little faster if it had a fan so it doesn't get throttled, but it's sufficient for my needs as a file server with a few USB external disks plugged into it.  Since it's only powered by 15Watts, you'll need a powered hub to run two USB external portable 2.5" disks, but it works fine with a single USB 2.5" disk and a USB stick.  3.5" external disks have their own power source, so they'll work without issues.I set up the system first on the back of my TV and enabled RDP, then moved it off the TV and placed it where I could attach disk drives and run as a file server and leave it "hidden" from view.  Since it has no fan, it's quiet.  The only sounds come from the external disk drives.  I gain access through Remote Desktop and remote Powershell if I need to use the system.Why didn't I get a RAID unit instead?  A RAID as a file server is not a backup.  You'd still need a 2nd unit, or a much larger single external disk for a backup.  I rather spend that money on more individual disk drives and make backup copies.  Most home RAID are also insecure, since they're linux systems that don't get regular updates, unless it's Synology.  The rest can get easily hacked because of outdated Linux systems.  RAID has its uses, but for most home systems, it's unnecessary.There are 3 reasons to get RAID:1.  Speed - More disks = more speed - I don't really need it for home2.  Uptime - if 1 disk fails, the unit remains up - My home system isn't under 24/7 usage and I have backups that I can easily swap to if it ever came to that.  I usually have a replacement in 3-5 years time, well before it fails.3.  Capacity - I'm not storing hundreds of TB.  They sell up to 20 TB disks now.  16TB is probably the cheapest $/TB right now (11/2022) and my older 12TB (back when it was the best $/TB) is still more than sufficient for my home needs.Hopefully, in 2-4 years time, they'll have a more powerful unit that I can upgrade to.  They're silent, and use very little electricity.