If you have a large amount of "other" files taking up space on your pool drive and would like to reduce the amount of "wasted" space then...
Warning doing this could stuff up you pc so go carefully and if it goes to pot its not my fault 
Your friend here is the powershell cmdlet "vssadmin"
if you run the command via an elevated powershell window
vssadmin list shadowstorage
it will list your vss stores etc
and then run
vssadmin resize shadowstorage /on=[drive letter]: /For=[drive letter]: /MaxSize=[maximum size]
See http://woshub.com/how-to-clean-up-system-volume-information-folder/
for more details
got rid of 70GB+ of unneeded vss data for me
Enjoy