

Exactly! I did that for a couple years until I found a cheap modem to replace the ISP modem. It didn’t do any routing, so there was no weird NAT issue, it just converted the DSL signal to Ethernet with a WAN IP.
I didn’t have to change any network settings on my LAN when I switched, or when I moved to another place with a different ISP. I had that same router for years, even after I got a dedicated AP for my house.
Makes sense.
I’m more interested in cutting off-site backup costs, so my NAS has RAID mirror to reduce chance of total failure, and offsite backup only stores important data. I don’t even backup the bulk of it (ripped movies and whatnot), just the important data.
Restore from backup looks like this for my NAS:
Personal devices are similar, but installing packages is manual (perhaps I’ll backup my explicitly stored package list or something to speed it up a little). Setup takes longer than your method, but I think it’s worth the reduced storage costs since I’ve never actually needed to do it and a few hours of downtime is totally fine for me.