If you only use Plex infrequently it can be a bit of a power waster for a standalone server. But one of the really cool things about Plex is photo backups from your mobile devices. If you'd rather not have them up in a third party, then it's a really great solution. Also Plex has streaming audio options, though it could be better with audiobooks. My storage array for Plex is in the same place as my home back up so it's never really wasted for me since I store all my files in one location and just open them at whatever computer I'm at.