That’s a pretty much old school combo from times before wide rims. Unless you are using ridiculously low pressure,  then no issues at all.

Will be fine, just don’t use modern low pressure, something ~40-50PSI.

Isn’t this what everyone used until wider rims became a thing?

17 mm used to be the standard XC width so 1.95 or 2.1 tyres were normal, 19 mm was trailbike territory so fat tyres like 2.25 or 2.4 were normal.

19 mm was trailbike territory so fat tyres like 2.25 or 2.4 were normal.

I have this combo (2.4F, 2.25R on xm719) on my hardtail and rode it 50km on Sunday. I am not dead

Just read this. Even if it’s not true you can pretend it is until you buy new rims

Myths Debunked: Wide Tires DON’T Need Wide Rims

You will not die. I had Open Pros until recently and they’re 15mm.

It’ll be OK, but I wouldn’t want a wider tyre on their. DT Swiss still made 20mm internal width XC rims until very recently.

You could run a 2.0″/50mm Terreno Dry on the rear to be sure? Vittoria do a gravel TnT casing version that should be tougher than the XC casing, and hence a big more stable even on a narrow rim.

fwiw, I run 2.6″ on 25mm internal width atm, at under 20 psi on the rear for my 77kg weight. No squirming, although that is mostly for XC riding on a single speed.