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I will need you to ZIP and attach the log file. Without it I have no idea what is going on and can't help you :(

Sorry for the delay. It seems that when I tried posting my answer earlier this week a network issue kicked in. I only saw it today that I was doing some clean up on past tickets. I'm terribly sorry about that!

I really don't see a problem. What I do see is that you have a ginormous table, #__jstats_impressions, with several hundreds of thousands of records. I'd suggest excluding that table using the Database Table Exclusion feature of Akeeba Backup.

There is also something more to note. Windows is notorious for terribly slow file system operations. Reading data from the database requires to, of course, first read from disk. I can see that you can read about 5,000 records per second. Obviously, of you have millions upon millions of rows this greatly increases your backup time. The bottleneck is the operating system. Not much we can do about it.

Finally, another thing. You are using PHP 5.2. PHP 5.3 is about three times faster than PHP 5.2. Also, PHP 5.4 is six to seven times faster than PHP 5.2. An upgrade of your PHP version will have a dramatic impact to the backup speed. These figures above come from my own benchmarks.