Tried walking through this is a dev environment and it failed. Migrating from ZCM 11.2.3/SLES 11.2 32-bit to ZCM 11.2.3/SLES 11.2 64-bit.

GUI message:

The MIGRATION of ZENworks Server is finished, but some serious errors occurred during the migration. Please see the migration log for details.

1. Backup of rmeote machines :: FAILED
2. Content Copy :: FAILED
3. Restore in remote machine :: FAILED
4. Network identity Migration :: FAILED

From the terminal window:

Error occurred while executing configuration action BackupRemoteLinuxServerAction. Check the novell-zenworks-configure.log file for more details.

I've checked this log file in /var/log/novell/zenworks and it's 0 sized on both servers involved in the migration.