The way I do it on my Mac Pro and Quicken (Windows installed with bootcamp, so no virtual file, and VMWare Fusion), is I have a mac directory mapped in Windows, and I just do a Quicken backup every day or so. It is local, so it goes fast. I probably should go cleanup my older backups, since they are still in the time machine, but I also use an online backup service so they also get backed up there.