So my house has two internet connections available to it. One was our main one (fast) and the other was a backup (very slow) when the main one went down (which was fairly often). The backup one has recently been upgraded so it's also a reasonable speed, so now I've been looking into whether it's practical and cost effective to set up a multihoming network (one network, two internet connections).

So I'm wondering if anyone has any links to good easy to understand guides to setting up a network in this way. I have heard that it's not really a great solution for a home, better to just allocate different devices to different routers/internet connections... This is what we're kinda currently doing but it makes some internet network functionality not work because, well, the devices are on completely different networks.

Any tips?