An external disk drive or a removable disk module that holds duplicate files. See backup storage and backup types.
"backup disk." YourDictionary, n.d. Web. 17 January 2019. <https://www.yourdictionary.com/backup-disk>.
backup disk. (n.d.). Retrieved January 17th, 2019, from https://www.yourdictionary.com/backup-disk
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