If you want to identify and segregate relevant data and preserve them for a long term for legal purpose, then you can convert a review set case to a legal hold case.
Procedure
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From the navigation pane, go to Data Insights.
The Data Insights page appears.
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Click Case manager.
The Case manager page appears.
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In the Name column, click the case to convert to a legal hold case.
The case page appears.
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In the upper-right area of the page, click Convert to legal hold.
A message appears confirming the request.
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Click Yes.