Time Machine backup increases as it runs

Question

I have a problem that it seems that many people have had but I have yet to find an answer, despite trying many of the things mentioned in these boards.
My time machine backups start saying that a resaonable ammount will be backed up (< 1GB) but always end up with over 30GB being backed up (out of a total of 40GB as I have excluded alot of files while I try to sort this).
So far I have
Performed a full time machine reset
Deleted all time machine backups and started from scratch.
Tried time capsule, network and local drives.
So far nothing seems to resolve this.
This is the log from the latest backup:
Starting automatic backup
Attempting to mount network destination URL: afp://xxxxxxxxx;[email protected]/Data
Mounted network destination at mount point: /Volumes/Data using URL: afp://xxxxxxxxxxx;[email protected]/Data
Disk image /Volumes/Data/xxxxxx’s MacBook Pro.sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
Forcing deep traversal on source: "Macintosh HD" (mount: '/' fsUUID: 3D9A5E6E-65F9-30D7-AF78-FBE5EC76C82C eventDBUUID: 4CC1882C-2A2B-4F8E-94C1-3F691818A4FB)
Deep event scan at path:/ reason:must scan subdirs|require scan|
Finished scan
Found 132882 files (701.4 MB) needing backup
3.72 GB required (including padding), 1.35 TB available
Copied 16.65 GB of 16.65 GB, 385064 of 385064 items
Copied 586699 files (34.01 GB) from volume Macintosh HD.
Created new backup: 2013-09-29-141156
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
Waiting for Spotlight to finish indexing /Volumes/Time Machine Backups/Backups.backupdb
Ejected Time Machine disk image: /Volumes/Data/xxxxxxx’s MacBook Pro.sparsebundle
Ejected Time Machine network volume.
One thing that I have notived us that the two lines below occur in every backup which does not seem right and I was wondering if this was related.
Forcing deep traversal on source: "Macintosh HD" (mount: '/' fsUUID: 3D9A5E6E-65F9-30D7-AF78-FBE5EC76C82C eventDBUUID: 4CC1882C-2A2B-4F8E-94C1-3F691818A4FB)
Deep event scan at path:/ reason:must scan subdirs|require scan|

Answer 1

I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
tmutil compare | open -ef
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. Each line that begins with a plus sign (“+”) represents a file that has been added to the source volume since the last snapshot was taken. These files have not been backed up yet.
Each line that begins with an exclamation point (“!”) represents a file that has changed on the source volume. These files have been backed up, but not in their present state.
Each line that begins with a minus sign (“-“) represents a file that has been removed from the source volume.
Files that you’ve excluded from backup, or that are excluded automatically, are ignored.
At the end of the output, you’ll get some lines like the following:
Added:
Removed:
Changed:
These lines show the total amount of data added, removed, or changed on the source(s) since the last snapshot.