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Which backup method is additive because the time and tape space required for each night's backup grows during the week as it copies the day's changed files and the previous days' changed files up to the last full backup?
Correct Answer: A
Explanation/Reference: Explanation: The Differential Backup Method is additive because the time and tape space required for each night's backup grows during the week as it copies the day's changed files and the previous days' changed files up to the last full backup. Archive bits let the backup software know what needs to be backed up. The differential and incremental backup types rely on the archive bit to direct them. Incorrect Answers: B: Full backups back up all files. Full backups are not additive. C: Incremental backups are not additive because they reset the archive bit so the file is not backed up again next day (unless the file was changed again). D: The tape backup method is not a method that determines whether the archive bit is reset or not; it just specifies that the files are backed up to tape. References: Krutz, Ronald L. and Russel Dean Vines, The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, New York, 2001, p. 69 http://www.brighthub.com/computing/windows-platform/articles/24531.aspx