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use many kinds of **backup media** for backup storage: hard drives,
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tapes, optical disks (DVD-R, DVD-RW, etc), USB flash drives, online
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storage, etc. Each type of medium has different characteristics:
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size, speed, convenicence, reliability, price, which you'll need to
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size, speed, convenience, reliability, price, which you'll need to
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balance for a backup solution that's reasonable for you.
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You may need multiple backup repositories or media, with one of