For very low-entropy files (with a lot of *[air](http://www.bircd.org/annoyances/image-rar/)*), putting them into a compressed archive could be worth it. But for files such as photos and videos, all ot does is making it significantly more prone to data loss while not saving much space. In case of unreadable sectors, a compressed archive will sustain more damage. Little damage at the beginning of a compressed archive with so-called solid blocks can lead to significant damage across the entire archive. Ah yes, better store it more than once.