I normally back up my mb to an external drive at home with time machine (it's been about 3 weeks since my last full backup). Recently a co worker sent me a file by placing it on a time capsule we have at the office. I grabbed the file and thought nothing of it.
Today I noticed that the time machine icon was spinning like it does when preparing for a back up and after investigating I found that my mb was trying to back up to that time capsule.
I removed the drive from my list of backup locations, is there any way I can ensure this doesn't happen again? Note that osx never asked me if I wanted to back up to the tc.