Operating System (OS)
Backups should be done

weekly for most installations
as several incrementals, followed by an image copy
None of these
daily for most installations
as several image copies, followed by an incremental

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Operating System (OS)
The Memory Address Register

is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these

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