Help Use Open Workbench To Manage A Project

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I use Open Workbench to manage a project "Main Project".
openworkbench
I found a problem, I need to set up a computer more, so I create a new project.
This project call "test motherboard".
I try to find computer cases to test the motherboard power panel
I mark computer cases, mark of computer cases as tasks
I insert this "test motherboard" project to "Main Project" as subproject.
Is this right?
I save this all projects files in Open Workbench install folder (C: program files ...), I shall save all projects files in another data hard disk (D?
How can I save all projects files backup, it can backup automatically when changed the files, and keep different copies of different time?
When I delete the file in error, modify the file in error, or the hard disk is damaged.
How can I manage Open Workbench backup in windows 2000?
Can I install Open Workbench in free operating systems?

And I also email to
quantatw
quantafremont
But they did not reply to me.
I obtain a service number in quantafremont.com, how can I record these?
I will track this number later.
How can I use Open Workbench to manage these?