Hello. I am experiencing Time Machine issues on my Early 2011 13-inch MBP running 10.10.1. I have two external hard drives that I use for Time Machine backups. I am experiencing the same issue with both of the external hard drives which leads me to believe that the computer is causing the issue. Time Machine backups begin normally, make a small amount of progress, and then progress stops. The computer shows that the backup is still occurring but no progress is being made. It will stay like that until I manually stop the backup. I've done disk repair on both external hard drives and the internal one. I erased one of my external hard drives and partitioned it and the problem continued. I restarted my computer and reset the PRAM (not sure if relevant) multiple times. I've included a screenshot of what the Time Machine preferences window looks like while the backup is stalled. Any help is greatly appreciated. Thank you.