When  sending in forms to the various governmental offices, from time to time  we are suddenly requested to update a certificate. An example is a few  years ago, a new law was passed necessitating certain health  professionals to submit their certificate / license and obtain a new  one.
When applying for the new certificate, many will advise you to just send it in and that it is not necessary to keep a copy. 
TIP: Make a copy anyway. If you can have it notorised too, so much the better. 
Recently  there was a fire in the Misrad HaBriyut in Jerusalem and a number of  files have been burned. In order to put files together, if yours was one  of those burned, Misrad HaBriyut will ask you to submit a photocopy of  all previous certificates. Having this copy will become invaluable to  rememdy an unforeseen difficulty.
