Hi Richard,
so when I backup my testsite and my livesite I get the following results:
- restoring test to test has no problem and works like a charm
- restoring live to live has the same issues as described above
- restoring live to test results in the same issues
- restoring test to live is the issue I described above
Therefor I don't think the backup has any issuess.
Which leaves the restore and the live server.
Restoring to another server has the same issue.