pcdoc & jim7jim
I would be inclined to do that, but do the restore after you re-install any contribs you are using.
That is not the recommended procedure.
A restore is done to a fresh installation of sme server, and then contribs are reinstalled. As configuration data is restored, you should not need to setup those reinstalled contribs again.
I agree that the issue of error messages after upgrade to sme8, should go straight to the bugtracker.
Also you cannot ignore the output of the newrpms command, it should list potentially problematic or incompatible rpms, of which you only now inform us that there are many. You must clean up your server before upgrading or you are likely to have issues (which you are having). It sounds to me like your server has been heavily modified from standard, so you just have to work through those issues.
Please advise the bug reference number here