Editing HorizonVirtual:Arcane Rewrites (section)

===Replacing and Copying Datapads===
A programmer can use the procedure for learning a rewrite to reconstruct a lost datapad. If she already has a particular rewrite prepared, she can write it directly into a new book at a cost of 100 RU per page (as noted in Writing a New Rewrite into a Datapad, above). The process wipes the prepared rewrite from her mind, just as executing it would. If she does not have the rewrite prepared, she can prepare it from a borrowed datapad and then write it into a new book.

Duplicating an existing datapad uses the same procedure as replacing it, but the task is much easier. The time requirement and cost per page are halved.