Restore Caveats

Restoring data from previous snapshot on same instance:
  If JIRA data (Testcase, version, project, component etc) changed since the snapshot is taken, this is likely to create orphaned references

Restoring data from previous snapshot from a another JIRA Server instance:
  This data can’t be restored.

Restoring data from a another JIRA OnDemand instance:
  This functionality is not supported.

Restoring data from previous snapshot with imported project:
  Because imported JIRA data has different identifiers, restore process will result in bad or orphan references.