Checking the size of incremental backups

I am backing up a VM that is running MS SQL Server 2008 for use with GFI MailArchiver. Our company has around 45 users and a mail volume of about 3 Gb per month, ~100 Mb/day. However, the daily backup size on weekdays is around 100 Gb! On weekends with very little mail traffic, the backup size is around 20 Gb.

From another thread:

The way the dirty bitmaps work, is by marking a whole block dirty even if just a single bit in that block has changed. So if the writes are small but...

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