Oracle : Ошибка ORA-01260

"warning: END BACKUP succeeded but some files found not to be in backup mode"
*Cause: END BACKUP completed successfully for all files that were in online
backup mode. However one or more modifiable files were found not
to be in online backup mode. Backup of those files (if it was done)
can be invalid and, if restored, can result in an inconsistent
*Action: Check the alert log for a list of the files that were found not
to be in backup mode. If there is a possibility that those files
have been modified during online backup, then replace their
backups with new ones.

Попробовать перевести

Поискать эту ошибку на форуме