[Zope] Upgrading to Zope 2.7

Hello, when I upgraded to 2.6.2 I copied the Data.fs to the new Zope/var directory. With this trick, I preserved the many roles I added in the root directory. However this trick doesn't function with Zope 2.7. How can I get my roles to Zope 2.7 without creating them once again? With kind regards Florian Reiser