Moppie wrote in post #19159079
Sounds like your looking for a DAS, or Direct Attached Storage.
They are less popular in the market than a NAS (Network Attached Storage) as they are less versatile and depending on how you work, can be harder to back up.
A NAS can sit anywhere you have access to the network, so it doesn't even have to be in the same building. A DAS needs to be physically close to your computer and plugs directly into it, usually via USB3.1 or Thunderbolt.
This means you can access a NAS from anywhere, and from multiple devices, and it means the NAS is independent, so it run a back up to a different device with out being connected to a computer.
The downside if access to the NAS is limited by the speed of your network. Since a DAS plugs directly into your computer access speed is limited only by the type of interface used, and USB3.1 and Thunderbolt can be 10x faster than most home networks.
But for the DAS to do anything it is reliant on being connected to your computer.
I run a NAS, it sits in a cupboard out of sight and out of hearing. But top get the connection speeds I needed I had to also install a managed switch and add a second nic to my PC allowing three network connections to be teamed together into a single connection.
But it does mean the NAS is always back up to a cloud service and I can access my files from anywhere with an internet connection, which has been more useful that I thought, having had to retrieve files for customers several times. I also have my phone back up to it, along with my email and other cloud based services.
It also meant I could move to an 8 bay machine, run two separate storage volumes and get RAID 6 for 2 disc redundancy and some performance. Currently it has about 24TB of total storage in it, and it's very easy to replace smaller discs with larger ones.
A DAS would work, I have USB3.1 connections on my computer, and I wouldn't have needed the extra investment in a managed switch, or the knowledge to set it up, but it would have meant finding somewhere near my PC to put it and I wouldn't have to remote connectivity that I get from the NAS.
Qnap, Lacie and Drobo all make reliable DAS devices with USB 3.1 and or thunderbolt connections.
Qnap make a couple that can be connected as a DAS, or as a NAS it has 4 bays supports all the common RAID types.
Lacie and Drobo both make units targeted at photographers and other creatives. They tend to be expensive and it's import to check what connection types they have, as some are Thunderbolt only. They are very clearly targeted at Apple Mac users.
But they have various options for numbers of drives and all support RAID 1 on the 2 drive enclosures and RAID 1,5,6 etc on larger multi bay units.
Lacie have a solid history and are well known for making good products.
Drobo don't have a great history, having made some RAID arrays in the past that failed with no ability to recover them and really bad support. They have since changed ownership, but I find the language on the website to be very misleading, it's clearly aimed at people with a high level of creative literacy, but a low level of computer literacy.
RAID 1 is great for redundancy, but remember that is all it is, if one drive fails, you have one copy left until you can replace it.
If both drives fail, if the computer has a power surge and fries everything, if it's stolen, if your house is lost, if anything happens to both drives, then you have lost all your data.
So you still need a proper back up. The same is true with a NAS or a DAS, you still need separate physical back ups, I use a cloud server and a large disc in a USB3 enclosure. At some point in the future that won't be big enough and I'll likely install another NAS at another location (likely family) and have my NAS back up to that.
Is there a reason why you want large external storage, rather than just putting bigger drives in your PC? 6 bays is a lot of space, and hardware RAID controller in a PCI slot running 6 or 8TB drives would give you 18-24TB of storage.