A non-full backup is automatically converted to a full backup in the following situations:
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First backup operation of a subclient.
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Backup operation run after promoting a secondary storage policy copy that is not synchronized with a primary copy for all the subclients of a storage policy.
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Backup operation run after a backup job of the recent backup cycle was pruned or disabled from a primary copy.
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First backup operation run after switching from a IntelliSnap backup to a traditional backup or vice-versa.
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First backup operation run after a CommCell migration operation.
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Backup operation run on databases after the following restore jobs were run on those databases:
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Point in time restore
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Transaction mark restore
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Partial or Piecemeal restore
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Backup operation run on a database after switching the recovery model for that database from simple to either full or bulk-logged.
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Transaction log backup is converted to a full backup if a broken chain was detected during the previous transaction log backup operation.
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Transaction log backup is converted to a full backup for a database that already performed the transaction log backup before it received a suspension request.