I've had it confirmed that the backup via Control:Mac on v2.449 has a bug in it.

This makes Control:Mac crash if the backup has a Tidal link in it. This is only for Control:Mac, Control:PC should work fine.

It explains why I'm able to backup on Control:Mac if I select a tagged group, but not my entire library.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.