Windows®
The backup device is specified by the LTAPEDEV parameter in the Informix® server parameter file. It is typically a tape drive. Alternatively, you can use a directory. If you specify a directory, it is treated like a tape device. The directory must exist and be writable by members of the Informix-Admin group.
The parameter LTAPESIZE determines the size of the backup media.
UNIX®
The logical log backup device is specified by the LTAPEDEV parameter in the database server parameter file. The device is typically a tape drive, but it can be a directory. If you specify a directory, it is treated like a tape device (that is, the directory must exist and be writable by user informix).
The size of the backup media is determined by the LTAPESIZE parameter.