[sclitheroe]

You could find something for the Mac, or you could write a script and schedule it on her machine, etc. But there's a problem with this approach - it's her machine, and that means you'll need to keep tabs on whether its running correctly, that she hasn't accidentally disabled it, etc.

So instead, I'd think outside the box and turn the process around. Turn on File Sharing on her Mac with the windows compatibility, and share out her home folder. Then, on your PC, you can write a small script that maps a drive to her home folder share, and uses robocopy to do a mirror copy of her home folder to a directory on the NAS. Schedule that to run hourly at night or something, and you'll have an almost-real-time copy of her hard drive. Since the NAS backs up to S3, you'll end up with a current copy in the cloud as well.

This is analogous to what we do in the server world - we never, ever, rely on the clients to send us backups, and assume that they are working correctly. The backup system reaches out to the clients and grabs the data it needs (usually via a software agent, but in our simple case here, Windows file sharing and robocopy will suffice)

I basically do this exact setup at home too - my wife's Mac is the "master" photo machine, with all of our pictures on it. The Mac Mini downstairs that is our media server runs rsync (the Unix equivalent to robocopy) and sucks down the iPhoto library on a regular basis, and that goes onto the attached storage array, which gets backed up to the cloud via BackBlaze. Essentially, I've implemented exactly what I outlined above, but with two Mac's, and it works great.