Dear Nikhil,
In Relation to your query, my suggestion to your friend is that he should not worry about keeping the original or xerox with him as long the xerox is made from the original without any manipulation.
The reason for this is : as per sec 63 , clause 2 and 3 of the Indian Evidence Act, 1872, the copies made the original by mechanical processes which in themselves insure the accuracy of hte copy and copies comparied with such copies will be taken as secondary evidence and as per clause (1) of sec 65, it isadmissible as evidence in a case when the original is in possession of the person against whom the document is sought to be proved.
i hope you will be satisfied with this answer.