What you did was actually a full restore of your JIRA Server into JIRA OnDemand and that wipes out everything that existed before. As for the sysadmin user, it is created automatically once the restore process is finished.
Since you want to migrate two projects from your JIRA Server into your JIRA OnDemand, my suggestion is that you follow our knowledge base article:
The process outlined in the KB article is for two OnDemand instances, but it can be applied to for one JIRA Server instance and another OnDemand.
I hope this helps.
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