So this is a decent idea? I realize that internals run slower than any decent external, and it would probably end up backing up constantly. I think when you set up Time Machine, it wants to back up hourly, and then erase everything from a day and back up for the entire day, and then after a month it erases all the days and makes one month. <-- or something like that.
The only bad thing is, Time Machine writes these files to my partitioned internal HD at like 5-10mb/s. So It isn't going to finish backing them up in one hour (it will be due for another backup every hour.) I just bought the Mac wireless external which is said to be capable of 200+mb/s. I guess well see.