Backup Hanging

Hi all. Running 360 on a 64 bit Windows 7 box.  I just attached a Western Digital portable 1 TB USB 3.0 drive to my USB 2.0 port.  I'm doing a complete backup as this is the first time I'm using this drive.  The backup took a few hours and the progress indicator showed the files being backed up as well as the percentage increasing.  After it reached 100% it went back to 0%, now says "Backup of your files and folders is in progress", status says "running" with animation and percentage is not moving.  I can see the drive in Explorer and access the N360_BACKUP folder.  What is this thing doing? It's been running for over an hour like this.  I specified that it verify the backup but shouldn't I see a progress indicator higher than 0%?  Also, while the backup was taking place the drive light was blinking.  Now it's not.  Thanks for any help.