/library/server/software update - can data be deleted?

I run OS X Server 2.2.2 on my Mac mini. I discovered that i have turned on the option software update. As i don't use my Mac mini Server for Software Update distribution i disabled this service.

Now i discovered that in folder

/library/server/software update

a lot of data is still stored. I tried also to delete the software updates available still in the disabled Software Update section within server admin.

Can i delete manuall all these software update .pkg files?