Don't rip it out of SQL either unless you are absolutely sure that it has never been used. You can check this by running the following SQL query on all your VaultStore Databases using SQL query analyzer:
select count(*) from saveset, enterprisevaultdirectory..retentioncategoryentry evdbrc where evdbrc.retentioncategoryname = 'business' and saveset.retentioncategoryidentity = evdbrc.retentioncategoryidentity
Replace the 'business' value with the correct name of the retention category you are querying for.