Hello, I have had my computer running Windows 7 for 5 months now. I just received an alert stating that my backup disk space (17.47gb), which is located on my external hardrive, is running out of space (2.00 mb). I know that the main solution would be to get another external hardrive and transfer my back up disk to it. However, is there an alternative solution to this? Also, does back up disk space increase over time or does this alert have to do with the storage on my external getting extremely low? Is back up disk space even necessary? Any help would be greatly appreciated.