This has been discussed before, but since there seems to be some disagreement I'm just trying to consolidate some information. The BT HomeHub wi-fi router has a spare USB port. I have a 500Gb USB2 external hd. Using this as a wi-fi drive with Time Machine doesn't seem to work because of differences in formatting (Fat32 etc.). Is there a safe and reliable workaround this issue? If not, what is a wi-fi backup alternative to Time Capsule? (I just don't want to pay for a wi-fi router that I don't need.) Thanks in advance for your advice.