Anything tape based can also suffer from print through, dropouts and oxide shedding and mechanical devices such as cassettes can malfunction. I have most of my music collection on a Brennan which is backed up to a 500GB hard drive. Apart from that, I still have all my old CDs, records and tapes. The CDs are also digitised in iTunes and backed up to an iPod and an iPad. It’s unwise to store anything dear to you in a single format.