Offline file storage without the use of NAS
To make a long story short I don't trust any storage device that in any way has an ethernet cable going into my router. I have a QNAP NAS which I thought was secure but it was still hit the qlocker ransomware a few weeks back.
I have a bunch of old documents, pictures, videos, and project work on an external hard drive that I recovered from the ransomware attack. I would like to have 2 copies of this data to protect it from drive failure and kept offline. Naturally a NAS is the first thing that comes to mind but I simply don't trust any of them any more. Is there any external HDD's that have 2 drives in it operating in RAID 1? Or is there any way to purchase 2 drives but have them run in parallel or any software that can mirror one drive onto another. To add another layer to this challenge I would like the data to be accessible by both windows and mac computers.
I appreciate any thoughts on this.