I have an iMac with a 2TB internal drive. I have an Airport Time Capsule with a 2 TB drive. The iMac has under 1TB on it. A few days ago, I got a backup failure stating there wasn't enough room on the Time Capsule - it needed something over 1TB. This is very confusing. The only change I made, and I have a feeling this has something to do with it, I swapped out another external drive because it failed. It's the same exact drive and I gave it the same exact name. I'm thinking it's trying to backup that drive now even though I have it excluded in my backup preferences. I also ejected it but still had the same problem. I'm working with Apple support... both devices are under Apple care. I spoke with a senior tech and he's scheduled for a call back. But something he said didn't sound right. He said the Airport wasn't meant to be used as a hard drive which is how I use it. I don't use it for wi-fi. He thought that could be causing my problem. He wants to change the configuration to replace my Verizon FIOS router with the Airport. Does this make sense?