Frequent Large Backups

For some reason my TM started backups up large amounts everyone once in a while (maybe every day) despite not changing much in my file system. It attempts to back up around 30 GB, which takes some time and is kind of an inconvenience. I have not changed much—other than saving a few files—to my file system, so I am not sure why it would need to do a large backup. Here is the latest log:
Starting standard backup
Attempting to mount network destination using URL: afp://Sean%[email protected]/Omega
Mounted network destination using URL: afp://Sean%[email protected]/Omega
QUICKCHECK ONLY; FILESYSTEM CLEAN
Disk image /Volumes/Omega/Seans MacBook Pro.sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
No pre-backup thinning needed: 34.87 GB requested (including padding), 1.06 TB available
Copied 3915 files (5.3 MB) from volume Alpha.
Backup canceled.
Ejected Time Machine disk image.
Ejected Time Machine network volume.
It doesn't seem like it is really changing my free space; however when I open the directory that the sparsebundle is saved under, it says I have 1.16 TB left (though it says 1.06 TB through the log). Anyway, I used DiskWarrior to check the sparsebundle and it appeared to be fine. Why would TM need to do this so frequently?
BTW, I have a 2 TB TC that I use for my TM drive.
Sean

Pondini wrote:
See #D4 in [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of this forum), for some common causes and ways to find out what's causing large backups.
I looked at this and it didn't seem to provide much help. It seems like I don't fall under any of the topics discussed. I am still continuing to back up large amounts of information despite very little changes (still around 30 GB each time). It seems like the backups are continuing to use large amounts of my TC's hard drive. I am now at 1.08 TB of space left. Do you think these large backups will continue until I have 1.06 TB of space available and then everything will return to normal? Thanks
Sean

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