The phrase "adequate backup" means having enough copies or alternatives of something, like files or data, so that if something goes wrong, you can still use the copies or alternatives instead of losing everything. Full definition
Every labor and delivery carries the risk of the baby dying, especially if the mother is attended by an incompetent practitioner without adequate backup in case something goes wrong. (skepticalob.com)
With neither Debuchy or Jenkinson leaving this Janaury, it means there is still adequate backup for first choice Hector Bellerin. (justarsenal.com)
An IAEA team reviewing the Japanese accident issued a preliminary report this week stating that Japan had underestimated the danger of tsunamis and had not provided adequate backup cooling systems at the Fukushima Daiichi nuclear complex. (scientificamerican.com)