For more information on this error, please see Microsoft's Books Online article on Tail-Log Backups.
Please contact the appropriate software vendor or IT professional for assistance with this process or issue, which is beyond Blackbaud's scope of support.
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Detach the existing database, from SQL via the BMC, and attach the database from the backup.
Change the recovery model of the existing database from FULL or BULK-LOGGED to SIMPLE, allowing the transaction logs to be automatically written to the database. Shrink the database, if necessary, to force this process.