Files in 'application data' folder

Hi,

I noticed that in the following folder
C:\Documents and Settings\Username\Application
Data\SourceGear\Vault_1\Client\
Sourcegear seems to have put quite a lot of files. The size of this
folder (including its subfolders) is about 850 mb (which is about 3
times the size of our complete sourcegear database!). What are these
folders for and is there a way to keep their size a little bit smaller?

Regards,
Jeroen Schmitz