Wow, 3 days later and nary a response. When Mcafee says the product is being discontinued, they're not kidding!!!
As you have stated - it isn't supported any more but Technical Support Chat may still be able to assist you via Useful Links at the top of this page.
I'm no expert and don't use that particular product but from the User Guide (page 167 onwards here: http://download.mcafee.com/products/manuals/en-us/MTP_userguide_2009.pdf ) I can only assume you have it set to run a full archive each time? If you ran a full archive the first time then only quick archives from then onwards, only stuff that had changed would be archived.
I would ask Technical Support Chat. They are free and available 24/7.
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