A Why Is It Important To Destroy Data On Backup

a) Why is it important to destroy data on backup media and PCs before discarding them or transferring them to someone else?
b) What is the difference between basic file deletion and wiping?
c) Is it safe to wipe a hard disk and then give it to someone else? Why, or why not?
d) What does degaussing do?
e) Name some effective methods of data destruction?
f) How can optical disks be destroyed?

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