[bornabox]

It's a common scenario, unfortunately. Synology RAID is nice. External USB on the same power circuit is not a good idea. Actually, I'd look at least into a surge protector. But it's quite possible to have those blow up and still fry your hardware.

I'd run some batteries in the basement and run my Synology (or similar) off of those. Additionally, the USB Backup of backups should be in the garage or the attic, if at all possible. Also, a nice cloud-backup solution that is capable of delta-uploads is a very good idea (cover against fire in the house, or any other "catastrophic" failure).

If you don't have DC experience or if you didn't do much hardware, it's common to over-focus on software. And to be fair, vice-versa :)

[tapland]

The issue is probably the Synology PSU and nothing else. This is the third Synology NAS breaking down with intact disks I hear about this month, and it seems to be quite a common issue.[0]

[0] https://www.youtube.com/watch?v=K7ly8zde3dE

[kingosticks]

The usb backup backup really, really cannot be at the same site. I'm not saying you have to stick it in the cloud but it's got to physically somewhere else.