Only the RIAA, MPAA, Universal, etc feel that way.
Under certain conditions as provided by section 117 of the Copyright Act. Although the precise term used under section 117 is “archival” copy, not “backup” copy, these terms today are used interchangeably. This privilege extends only to computer programs and not to other types of works.
Under section 117, you or somepony you authorize may make a copy of an original computer program if:
the new copy is being made for archival (i.e., backup) purposes only;
you are the legal owner of the copy; and
any copy made for archival purposes is either destroyed, or transferred with the original copy, once the original copy is sold, given away, or otherwise transferred.