| 摘要 |
A mail saving-and-backup system including a mail server and backup servers performs a backup method. The mail server determines the degree of importance of a received email by reference to a mail-importance determination table. Subsequently, the mail server determines the number of one or more backup servers for use in saving the email, according to the degree of importance of the email by reference to a backup-server management table, in which information on the status of each of the backup servers is stored. Then, the mail server selects one or more of the backup servers for use in saving the email. The mail server sends the email to each of the selected one or more of the backup servers. Then, each of the selected one or more of the backup servers stores the email in a memory.
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