Gas is a terrible for backup for wind/solar, especially further up north. Even in countries who in optimal weather can have 100% energy from wind (Denmark reached this a while back), gas and other fossil fuel power plants are still the single highest source of emissions by a large margin. Wind operate on average around 40-60%, which mean that half the energy used has to be sourced elsewhere. When ~50% of your energy comes from "backup", then the word "backup" looses its meaning, and that is in fairly good situation where wind has been built out to have 100% capacity.
I could see an argument for gas if it was used less than 1%, and with a decrease use as the grid expanded their capacity, but that is not the reality we got in northern Europe. Instead we see an increase in fossil fuels usage each year. With increase use we also get increased prices, with energy prices being exceptional high and rising. Politically this is a terrible loss for everyone except those investing into fossil fuels, and in the current economical downturn, fossil fuel companies are doing very well at the moment.
Ofcourse if you get your gas from a not so friendly imperialistic autocrat who decides to go full in on military territorial expansion and uses gas as a economic weapon you are screwed and need to do whatever you can and is necessary.