Time Machine won't backup
Good evening. Time Machine will not backup my laptop. It says that the backup disk is not available. I restarted my laptop after updating my laptop and it still doesn't work. I used to live with my grandmother from Monday to Friday and then go to my mother's place and I backed up my laptop to the Time Capsule from my grandmother. Now I connected to my mother's Time Capsule and it doesn't work. Can you please help me?
Here are two screen shots:
Mac Pro, OS X Yosemite (10.10.1)