Question: A differential backup covers what data on a system? a . It includes all data every time it is performed. b . It includes only

A differential backup covers what data on a system?
a.
It includes all data every time it is performed.
b.
It includes only data that has changed since the last backup.
c.
It includes data that has changed since the last full backup.
d.
It includes data that has changed since the last incremental backup.

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