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A comment on The 3-2-1 Backup Rule – Why Your Data Will Always Survive (2019). Parent comment

Re:The 3-2-1 Backup Rule – Why Your Data Will Always Survive... by Someone1234 on Wednesday November 24, 2021 @03:08PM (#29334504)
Whereas I think that isn't a backup at all, because it is plugged into the same machine (i.e. online backup) and therefore going to get crypto-lockered.
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Re:The 3-2-1 Backup Rule – Why Your Data Will Always Survive... by Teever on Wednesday November 24, 2021 @06:28PM (#29336441)
A USB drive hooked up via ESATA or USB is directly comparable to an LTO tape.
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Re:The 3-2-1 Backup Rule – Why Your Data Will Always Survive... by Dylan16807 on Friday November 26, 2021 @09:03AM (#29350238)
So is a tape left in the drive.

If you can move a tape to a shelf, you can unplug a USB cable.

And to your question about having a separate machine, a Pi will be fine.

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Re:The 3-2-1 Backup Rule – Why Your Data Will Always Survive... by Denvercoder9 on Wednesday November 24, 2021 @03:12PM (#29334559)
Neither SATA nor USB implies permanence.
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