I would like to TM over WiFi. I have an external hard drive that I currently plug in to my MBP. I would like some advice on the cheapest solution vs going the time capsule route while still utilizing this HD. I assume my Xfinnity router is of no use? I also have an iMac. Could I plug it into that and access it? Make it a network drive of some sort? I’d also like to be able to use CCC to backup to it over WiFi/network? Is there something I could buy used on eBay since my machines are so old? Any help appreciated.