System Analysis and Design
Back-up procedure helps in

all of the listed here
restoring the data files whenever there is a system crash
none of the listed here
restoring the operation whenever there is a disk failure

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System Analysis and Design
Acceptance testing is

testing changes made in an existing or a new program
making sure that the new programs do in fact process certain transactions according to Specifications
running the system with line data by the actual user
is checking the logic of one or more programs in the candidate systems

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