I too am having problems with backup crashing after the update.
Using control Mac I normally back up to a USB disk connected directly to the Mac and also to a Networked NAS. Control Mac crashes during backup to both.

Roy

861v8+ID41, DSP8000, DSP5200HC, DSP5200, HD621, Lumagen Radiance XD, Panasonic TH50VX100, Dune 3.0. All controlled via Philips Pronto 9600 & iPad 3. (Living room).
MS200, DSP320's speakers (Kitchen).
Roon server on i7 Sonictransport supplying the 861,MS200 and a couple of SB touch.
Explorer for my Mac Pro.