I am totally paperless, and I always keep pdfs that serves as the archive copy. The reason to do this is because program updates, law clarifications, and retroactive law changes subsequent to filing can change any return that is generated by the program when it is reopened.
I use the document manager and print everything to pdf that I then print the client paper copy for them. The client copy pdf is usually an abbreviated copy where I've decided what is necessary and also those backup worksheets ("keep for your records") that I deem useful to provide, and that pdf contains exactly what is given to them. The preparer copy pdf has much more: the entire return plus all of the computer-generated notes, preparer notes, due diligence, backup worksheets not actually e-filed, and transmission reports.