I have a brand new 2TB Time Capsule and it works fine. I can use it as a Time Machine back up for my Early 2015 rMPB and access the drive without error. However on my Mid 2011 iMac 21.5" I cannnot use the drive as a Time Machine back up. I cannot access the drive either. It will "connect" but when I click on the only folder it simply says "sharepoint" and when I try to use it as a time machine back up it fails. Any help here?