Hi there,
I know that my question seems a bit weird and may seem naive/newbie and I appreciate you for your response:
Is it possible to run the BOINC client in offline mode? Actually, what I need to do is to catch the work inputs of a project and let my machine to calculate the result. Later, I want to be able to re-execute some of the works and compare the results with the previous execution. Is there any way I can achieve this? Must it be project specific or any BOINC project works?
Best,
-- Moez

I don't believe there is a way to do this outside of downloading work to say a virtual machine and then possibly cloning the virtual machine. However, some smarter people in here may have a better way.

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For what you're asking, you don't want to run the BOINC client in offline mode: you want to run the science applications developed and distributed by your chosen project. Those applications are the ones which produce the scientific outputs, which are indeed worth comparing for both speed and precision.

The third-party developers for SETI@Home have a bench-test suite - basically a complex Windows batch file, plus some utilities - which allow testers to run comparison tests for arbitrary versions of the science application against arbitrary test or selected datafiles. The script records comparative timings, and the utilities measure the quality of the results (a process similar to project validation).

So it can be done, but it would be specific to the project which you have in mind to study. The validation utility, in particular, might need to be re-coded from scratch to mimic the requirements of your chosen project.