I have a desktop computer running Windows 7. I have a Macbook Pro running OS X. Is it possible for me to make my Windows machine visible to my Macbook Pro (as an external drive) and then create a Time Machine backup somewhere on my Windows machine? Right now, the only other option is to buy an external hard drive. I don't want to buy one just yet. In layman terms, is it possible for me to enforce a 'Target Disk mode' in Windows 7. Where my Windows machine acts as an external hard drive. I'd rather not do it over my internet as USB would be faster in my opinion.