Ah, so it's expected. You are correct, I can sort by the other columns, but the values for enabled are all checked and the values for Storage are all the same...so not useful to sort in this scenario.
But I would find it useful to sort by days because I try to space out weekly overnight backups with 2-3 each night...and if I add a new backup rule, I cannot sort by days to see which day would be best to add to - they are all out of order.
I can sort by Start Time, but then the days are now even more un-sorted.
A feature request maybe?