I'd love to keep red backs out of my shed...
Hey Bird
Sound's silly I know, but do you have any / many Daddy Long Legs round the place?
If so, try carefully collecting them & moving them to the shed, as they are apparently the number-one enemy of Redbacks!
Have been told by a number of Telstra techs & sparkies, that if they have to go into a roof & they find DLLs, they go in happily, knowing there'll be no RBs in there.
No guarantees
, but got to be worth a try