How to stop Time Machine from backing up Temp Files?

Hi folks!
I am trying to find out how to stop Time Machine from constantly backing up 'useless' temporary files accumulated from web browsing? Although I don't change or add large files to my HD, Time Machine backs up hundreds of MBs every hour. Those file amounts make sense when I consider that I browse a lot to YouTube, SoundCloud, etc to watch videos or listen to music - I just don't want them to be backed up.
Under Time Machine Options I already excluded the following items from backups:
~/Library/Caches
/Library/Caches
~/Downloads
But even though I did this weeks ago, Time Machine stills finds large files to be backed up every hour and my only guess is that I am still missing a location where either Safari or Firefox - the two web browsers I use - store temporary files.
Can you help?
Thanks a lot in advance!

oas2103 wrote:
they come from my anti-virus software
Are you sure you need that? There are no viruses that run on OSX. None. Zip. Zero.
If you're running Windoze on your Mac, that's the same as running it on a PC, so it needs all the same anti-everything stuff you'd use on a PC.
There is some "malware," such as Trojans, for Macs, though. But (unlike viruses that can get onto your system without your knowledge), you must approve their installation (via your Admin password) and/or operation (via the "This application was downloaded from the internet ..." prompt).
Appropriately enough, some of these Trojans are included in pirated versions of Apple software, such as iWork!
For the gory details, see Thomas Reed's [Mac Virus Guide|http://www.reedcorner.net/thomas/guides/macvirus].
Thanks a lot again!
You're quite welcome, and thanks for posting back.

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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).
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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.
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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?
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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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How can I get my time machine to allow me to recover files again? After upgrading to OS X, the time machine still backs up the files; but, I'm not able to navigate within the time machine or select any folders or files for restore.

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