Operating System (OS)
The Memory Buffer Register (MBR)

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.
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".
None of these

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Operating System (OS)
Backups should be done

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

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