What is Uptime guarantee?

An uptime guarantee is the share of time a provider commits to keeping a service reachable, and it is normally written into the service level agreement with credits as the remedy. Higher figures are better, and small differences still add up across a year of trading. 20i guarantees 99.99%, 3v-Hosting guarantees 99.98%, and A2 Hosting carries a guarantee of 99.95% to 99.99% across its plans.