Many times it happens that Organizer goes in long wait-time while taking Backup of Catalogs and at times, overall performance goes down. At this point of time, people think that Back feature has stopped working.
There can be various reasons for slow response, but one of the main reason found on forums is - External Drives. Not all, but some of the external hard-drives create this problem. So simply remove your external drives and see if it helps.
Here is one of the sample post on Adobe-Forums which talks about a similar problem - http://forums.adobe.com/message/4458794#4458794