It appears that running two mobile broadband modems, one on Optus and one on Telstra is working.
Added to the mix this year is a Canon 6D connected wirelessly to a Mac so that each photo is automatically downloaded from the camera to the Mac - and the Mac automatically copies it to another disk. So three copies as soon as I take a photo!
The second Mac is running LiveCam and a third Mac (on standby) is ready to replace one that breaks - or it can be used as a guest LiveCommentary machine. Added to the mix are two WiFi routers (one active and one on standby) and spare disks in case something fails.
Next step - automatically load photos to somewhere...LiveCommentary or www.swoose.net or Facebook or....