cvs tool and a dms project

   i am a new user and also new to problem is i have to do a project in document management system(dms) and finally have to go for version control by integrating cvs.(that's all i know).in dms i have to have a root directory where all the docs r stored,and go for upload files,download,modify etc.the doubt is should i maintain different versions of docs after modification in my project or just go for overwriting and have 1 final copy now,because finally i have to integrate cvs and show version control.this might be quite a simple doubt,plz bear,i guess i am going to have million doubts hereafter.
thanks(it took a lot of effort to mail,guess my ques is not dumb)
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if you have setup cvs, it will do all versioning for you, you don't need to make backup copies yourself

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