Windows 7 - Backup is a mess

I have a WD USB3 1T External H.D. that I use as a backup. I don't know if I should use the software that came with it or use (Acronis True Image Home 2010) My Data Drive is D:\ and my backup is E:\ When I change things in my Data Drive it backs it up but after a while I end up with 50 gigs of change and redundant data and it looks like a mess. It sounds to me that a mirror drive might be a lot better than a backup? Then when I want to delete some of the data on my Backup it won't let me and tells me that it isn't there. I always backup up manually which always works and now when I am using a backup all I have is a mess.

It depends on how your backing it up acronis does exclude some files by default from being backed up. Now when I use acronis I use the home 2011 cause 2010 seemed to give me issues and wouldn't even reconize it's own image as it's own my version that I use is not the latest but this one file version 14.0.0.6597 and haven't had any issuse's with it. I do mine manually as well and also delete the old image and make a new if I know there's no malware or anything of that nature....