There are USB connected HDD enclosures that take more than one drive.
Some of those offer some extra features like cloning one disk to another or joining the disks in a RAID.
For cloning it's usually a button that has to be pressed and for RAID it's some dip switches that have to be set in the back. Maybe there are even more "extra features" like this.
[I know there are special devices that copy SD cards to a HDD, but I think they count as NASes.]
What is the established opinion about these?
My first reaction was "HELL NO!!", a little button/switch on the device that may overwrite my data seams like a terrible design. Maybe I'm to paranoid and there is a legit use case, besides "dumb user".
Those features don't seem that easy to implement in hardware and I would rather have a read-only mode on my USB-to-SATA device.