Yes have read the several other threads relating to unknown error.
* Increasing the "segment size" to 8000 seems to assist in creating a backup.
* Increasing the "segment size" to 10000 seems to assist in restoring a backup..
Download > Upload to Snapshot folder to restore.
Domain A - backup..
Domain B - restore to after upload to snapshot folder..
Domain B - restore provides a snapshot and home directory appears as it should..
All other menu items and pages whilst being viewable in admin give a 404 error when clicked.. Path appears to be correct but no data is visible front end..
Next restore including "CONFIG" file produces expected home page but all menu links go to DOMAIN A path (ie the backup site not the restore domain of DOMAIN B as expected)