\dˌɪfəɹˈɛnʃə͡l bˈakʌp], \dˌɪfəɹˈɛnʃəl bˈakʌp], \d_ˌɪ_f_ə_ɹ_ˈɛ_n_ʃ_əl b_ˈa_k_ʌ_p]\
Definitions of DIFFERENTIAL BACKUP
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A kind of backup that copies all filesthat have changed since the last full backup. Eachdifferential backup will include all files in previousdifferential backups since the full backup so to restore aversion of a file, you only need to search the full backup andthe relevant differential backup.Some systems support differential backup by associating an"Archive" flag with each file and setting this flag wheneverthe file is modified to indicate that it should be included inthe next backup. A differential backup does not change thisflag, whereas an incremental backup resets it.
By Denis Howe