Backup System is composed by various application programs. The backup is completed by the messaging and
collaboration of these independent but related applications. Due to the limitation of the traditional IPC applied in backup
system, we propose a new technique which will solve the problems created during the backup process, that is, subject-oriented
IPC by taking advantage of PostgreSQL. In this technique, PostgreSQL is in charge of information storage and
management as well as the communications among applications. The subject is the substance ( for instance, backup sets)
operated by the communications made among applications. Message related to subject will be stored in database which is
connected by various applications. Communication and resource sharing will be achieved by connecting the same
subject.
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