Why is Time Machine suddenly backing up GBs of data every hour?

A year ago, I had issues with Time Machine backing up GBs of data even if nothing had happened within the previous hour. With the help of Apple my 13" Retina MacBook Pro was stripped down to nothing and a completly reloaded one application at a time. Now, almost exactly a year later, yesterday it started backing up 5 or 6 GB to my Time Capsule even though the computer was sitting unsued overnight. Niether Safari or Mail were running. I do run VMware Fusion but that has not been an issue for the past year and I have not yet updated to it's latest version.
I've tried powering the computer down and back on but to no avail.
Is it possible that the Time Machine software has become corrupted and, if so, how can I reload it?

Virtualization software such as VMware, Parallels, or VirtualBox creates a large virtual-disk container that is constantly changing, so it has to be backed up every time Time Machine runs. That will quickly fill up any backup destination.
You should exclude the virtual-disk file(s) from your Time Machine backups. To do that, click the Options button in the Time Machine preference pane. You may also be able to do it in the virtualization app's settings. Back up the files on the virtual disk from within the guest system, using a native backup application.
A compromise solution is to create a "snapshot" of the virtual machine in the virtualization software (not a Time Machine snapshot.) That will give you a single large file that never changes and only has to be backed up once. All the subsequent changes will be stored in a new file that's initially much smaller, but will grow over time. You should still exclude that file from TM backup. If you ever need to restore the VM from Time Machine, you'll have a working setup, which will make it easy for you to restore the rest of the data from within the guest system.
Another common cause of large TM snapshots is native OS X disk images. If you store a lot of data on one or more writable disk images, they should be in "sparsebundle" format, which will be backed up much more efficiently than any other format. A sparsebundle might be copied in an inconsistent state if it's backed up while the image is mounted and in the process of being written to. Make sure you unmount the image often so it can be backed up safely. Consider eliminating large read/write disk images from your workflow, if possible.

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    Peruse Pondini's TM FAQs, for information.

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    Hi,
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    Shadow99999 wrote:
    Hi,
    My 2TB backup drive recently became full, and I became curious as to what was filling it up. I wrote a perl script to analyze the Time Machine backups,
    No need to write your own script for that. there are a couple of already made nice GUI tools for this - TimeTracker http://www.charlessoft.com/ and BackupLoupe http://soma-zone.com/BackupLoupe/
    and I noticed that over 50% of my backup was filled with AP.Thumbnails and AP.Minis from the Aperture project directory. In particular, the AP.Thumbnails files in the backup consumed 737 GB of disk space!
    The problem with the thumbnails files is that they are a single file that contains all of the thumbnails for all of the 40,000 photos I have in Aperture and it is now 20gb in size. Every time I add a new file to Aperture, the thumbnail file changes, and I get a new 20gb of data added to my backup. I add photos often which means that most of my backups have 20gb of Aperture files (which are easy to rebuild and don't need to be backed up).
    I decided to try and stop Time Machine from backing up these files, and there seems to be no way of doing so (without telling Time Machine to skip backing up my entire Aperture project which I don't want to do). In Finder, you can do a "show package contents", but the Time Machine GUI doesn't allow this.
    I tried to tell Time Machine to exclude the files via the GUI, but Time Machine sees the Aperture Library as a single package and won't let me exclude individual files from within the package.
    I don't have aperture but I think most people exclude the whole thing from TM backups and back it up separately. but if you want to exclude a subfolder in a package that's easy too. just select the package in finder, control-click on it and select "show package contents". in the resulting finder window drill to the folder you want to exclude and drag it to the TM exclusion list in TM system preferences->options.
    I googled around, and found the attribute that Time Machine puts on files to exclude them from the backup. I used xattr to set the attributes:
    xattr -w com.apple.metadata:comapple_backupexcludeItem com.apple.backupd <filename>
    I was not aware of this method for excluding stuff from TM backups. could you provide a link to where you found this?
    I also used this command on the iPhoto thumbnail files.
    I used spotlight to find all of the files with this attribute using this command:
    sudo mdfind "comapple_backupexcludeItem = 'com.apple.backupd'"
    This command returned the iPhoto files, but did not return the Aperture files.
    that's because Spotlight never looks inside packages unless you start a search inside a package directly. iphoto seems to be the only exception. I don't know how it's done.

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    AFreeman wrote:
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