I'm losing 2GB of free disk space every day. How can I prevent this?

Every day this week I notice that I lose about 2GB of free disk space on my MacBook Pro. I'm now down to 20GB. When I started the week, I had over 30GB. I haven't installed any new programs of signficance. I store my large documents (photos, music, movies) on an external hard disk. While the MBP is not giving me problems, performance-wise, I'm concerned about the constant loss of free space.
I checked the size of my sleepimage and swapfile in /private/var/vm and they appear to be normal. The sleepimage size remains constant at 4.29GB and there is only one swapfile that is using 67.1 megs.
I don't seem retain disk space even after clearing the User and System caches, repairing permissions, and restarting my computer.
I checked my recent Console messages and here is a short snippet:
5/13/10 9:49:04 AM com.apple.launchd.peruser.514[285] (com.shirtpocket.backuponmount) Throttling respawn: Will start in 9 seconds
5/13/10 9:49:13 AM osascript[3781] Error loading /Library/ScriptingAdditions/Adobe Unit Types.osax/Contents/MacOS/Adobe Unit Types: dlopen(/Library/ScriptingAdditions/Adobe Unit Types.osax/Contents/MacOS/Adobe Unit Types, 262): no suitable image found. Did find:
/Library/ScriptingAdditions/Adobe Unit Types.osax/Contents/MacOS/Adobe Unit Types: no matching architecture in universal wrapper
5/13/10 9:49:13 AM com.shirtpocket.backuponmount[3781] osascript: OpenScripting.framework - scripting addition "/Library/ScriptingAdditions/Adobe Unit Types.osax" declares no loadable handlers.
5/13/10 10:31:20 AM PreferenceSyncClient[4405] Preference plist was NOT a dictionary.
I reviewed my Login Items and there doesn't seem to be anything out of the ordinary there that could be chewing up disk space.
GrowlHelperApp
AdobeResourceSynchronizer
textexpanderd
iTunesHelper
Rogue Amoeba Schedule Helper
VMware Fusion Helper
Dropbox
Lastly, I did a search in Finder using the following criteria and came up empty:
Kind is Any
File visibility = Visible or Invisible
Last modified date is within last 5 days
Size is greater than 10 MB

Yes, I'm running TechTool Pro 5 and it definitely looks like the Data Recovery feature is causing the disk space to be lost. I see lots of recent dates under the Directory Backups list. Looking at the Help guide, I haven't yet found how to turn this feature off.

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