tips-computer-backups

You need to have some OFFLINE backups (e.g. to a DVD) in addition to backups to hard drives which are always connected (like external USB drives including Time Machine).

I'm going to try the 25GB M-Disc Blu-ray. Unlike pressed DVDs that you buy in stores, most consumer-writable DVDs (i assume this includes blu-rays) can decay over short periods of time (a few years). M-Disc is supposedly a consumer-writable DVD that won't decay so easily. It has both DVD and Blu-ray variants.

note: DO NOT WRITE OVER THE DATA STORAGE SPACE OF CDS OR DVDS, EVEN WITH A CD/DVD-SAFE MARKER. Write only in the non-data-storing centre