I want to backup the captured photos as I take them tethered. Is there an easy way to do that? When I import photos(non-tethered) there is an option to select a backup location. Is this also possible during tethered operations?
This can be done very easily either wired or wirelessly - try using the Canon software that came with your DSLR. There are even new Powershot Canons that can download videos directly to YouTube. Here is a link on how to use Lightroom with any camera http://www.youtube.com/watch?v=ZPrCVhJSkiw&feature=fvwrel or just go to YouTube and look thru the dozens of videos on how to tether your camera to find one that fits your equipment. I have used the Canon software, but I believe that needs to be hard-wired.
In re-reading your thread, I see that your issue is not how to tether but how to make a back-up of the captured images - I believe that Aperture does have that option but Lightroom 3 does not, maybe Lightroom 4?? Also, if you're using a Mac, I think you could create an Automator action to do the copy, then attach the action to the folder.
I don't tether to my master computer. I tether to a studio laptop that uses an automated transfer to send those files to a watched folder for import on my Main box. I end up with two copies but on disparate machines. Three if you count the memory card. I think it would slow down the tethering process but agree the option to have it for Watched folder and Tethered import should be there.
What I think I'm going to do is after the shoot back up the file I have on my laptop to an external drive and then transfer that file to my main box. I have another issue but that is for a different forum. Briefly, thunderbolt drive by segate (goflex pro) overheats so I can't keep it running for the entire session.
Software like SmartSync Pro (pc) among other things can be set up to monitor a "hot folder" and create a copy of whatever is in it, will run in background on the fly or later. I use this when copying files from a CF card to my workstation HD and an external drive...