My last backup didn't work. It said I had to insert a new disc. I have never had this problem before. I always back up to my hard drive and once a week I backup to a flash drive and the file is usually around 10,300 KB. I have deleted many of my previous backups to make room but it still is backing up multiple huge files like just 1 of the 9 files was 2,780,747 KB.  Does anyone have any ideas why this happened and how do I fix it. I have just done up to a year end and really want to back this up asap. Help very much appreciated, thanks.

 Christina.