You've discovered the downside of using an imaging tool as a backup tool - the amount of storage required!
Things change constantly inside of Windows, and most of the changes are unseen and are within the largest directories on most systems. You can run this free program to get an idea of all the stuff that's going on: http://www.microsoft.com/technet/sysintern...essmonitor.mspx
These changes will keep the size of the incremental backups large, and 30 minutes is about the right time to make an image.
I would suggest saving the original image, deleting the incremental images, and creating a new image as of this date. Then, limit yourself to a certain number of images in case of disaster. I used to keep several, but now only keep one image with everything that I consider essential on my system.
Then, do your backups separately. I'm not familiar with the Acronis backup tool (having used SyncBackSE for many years) - but only backup the data files that you can't replace. Back them up daily and they'll take less space than an image will.
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