If I was traveling a lot it could be useful to have a Linux on USB always with me. But then I'd also like to have a backup solution Let's assume this would be

If I was traveling a lot it could be useful to have a Linux on USB always with me. But then I'd also like to have a backup solution Let's assume this would become your main OS. It would need to run on any hardware, that means support for l the archs, or at least x86 and arm (in the broadest sense). And it would need lightweight (in the actual sense) backups. I'm thinking about a backup station where you insert you main OS stick before you go to bed. It would have 2 drives, in case 1 fails. And an ethernet port (or wifi additionally) for external backups. So you insert it, go to bed and when you wake up you have internal and external backups. But I think that there aren't too many people interested in having their main OS on a USB drive. One might have to provide a cpu/ram/drive bay along with it. And there would need to be a simple drive swapping process and low cost case replacement option. USB should not bottleneck the data transfer rates. So I searched and of course something similar already exists. But not the way I envisioned it. A USB 3.2 to m.2 adapter, with its own power supply, and a sata 3 port where you can plug in a drive to create or restore backups. No ethernet port or network connectivity. My vision is a case, a station, that does incremental backups to 2 slot inserted drives and optionally to (configurable) remote targets in sequence. The USB port would need to be high quality. Would I support SATA? No, maybe. Initially only m.2 connectors.