--copy_only
The parameter is used with the backup exchange_database command only if the --backuptype parameter value is full.
The copy-only backup method allows creating full backups without truncating the transaction log files. The method can be used to obtain a full backup without interrupting other ongoing backups. The copy-only backups can be easily stored off-site for testing, analysis or other purposes.
The parameter cannot be used together with the --express parameter.