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 instance:
This data can’t be restored.
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Restoring data from previous snapshot with imported project:
Because imported JIRA data has different identifiers, restore process will result in bad or orphan references.
Restoring Test Cycle and Execution Details for tests issues when moved between projects
This functionality is not supported.