1. Create workflows that capture a field's value when the record is saved.
2. Use Reporting Snapshot to capture data at a point in time. (See the limitations in Help & Training article Troubleshoot Reporting Snapshots)
3. Change the relationship of the custom object to a "lookup" relationship from a master-detail relationship.
Note: There are implications with this change, and we advise further research into this topic. To do so, please review Object Relationships Overview.
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