Authentication

Hi Iñaki

I took a fresch backup (see the settings) and repeated. Still the message is:
"Some problems were detected when checking user data (Trying to restore user 'alisa.sample' from backup file will cause conflict, Trying to restore user 'admin' from backup file will cause conflict)"

I unzipped the backup file. moodle.xml has admin in two places:
<BLOCK>
        <ID>175</ID>
        <NAME>admin</NAME>
        <PAGEID>23</PAGEID>
        <PAGETYPE>course-view</PAGETYPE>
        <POSITION>l</POSITION>
        <WEIGHT>3</WEIGHT>
        <VISIBLE>1</VISIBLE>
        <CONFIGDATA>Tjs=</CONFIGDATA>
        <ROLES_OVERRIDES>
        </ROLES_OVERRIDES>
        <ROLES_ASSIGNMENTS>
        </ROLES_ASSIGNMENTS>
...
      <USER>
        <ID>2</ID>
        <AUTH>manual</AUTH>
        <CONFIRMED>1</CONFIRMED>
        <POLICYAGREED>0</POLICYAGREED>
        <DELETED>0</DELETED>
        <USERNAME>admin</USERNAME>
        <IDNUMBER></IDNUMBER>
        <FIRSTNAME>Site</FIRSTNAME>
        <LASTNAME>Administrator</LASTNAME><code>
there are many users in the form
<USER>
        <ID>1610</ID>
        <AUTH>ldap</AUTH>
        <CONFIRMED>1</CONFIRMED>
        <POLICYAGREED>0</POLICYAGREED>
        <DELETED>0</DELETED>
        <USERNAME>angela.sample</USERNAME>
        <IDNUMBER>angela.sample</IDNUMBER>
        <FIRSTNAME>Angela</FIRSTNAME>
...

Why there are so many users in the backup?

Just to make sure, my original idea of a cleaning the Moodle from old information should work, correct?