The availability of a website is measured by the percentage of a year in which the website is publicly accessible and reachable via the Internet. This is different from measuring the uptime of a system. Uptime refers to the system itself being online. Uptime does not take into account being able to reach it as in the event of a network outage.[citation needed] A hosting provider's Service Level Agreement (SLA) may include a certain amount of scheduled downtime per year in order to perform maintenance on the systems. This scheduled downtime is often excluded from the SLA timeframe, and needs to be subtracted from the Total Time when availability is calculated. Depending on the wording of an SLA, if the availability of a system drops below that in the signed SLA, a hosting provider often will provide a partial refund for time lost. How downtime is determined changes from provider to provider, therefore reading the SLA is imperative.[11] Not all providers release uptime statistics.[12] Most hosting providers will guarantee at least 99.9% uptime which will allow for 43m of downtime per month, or 8h 45m of downtime per year.
14. FasthostsFasthosts is another reliable and secure hosting/domain provider trusted by top brands around the world. It lets you build professional websites and e-Shops, host and manage existent ones, or use any of its well-known hosted email or Microsoft exchange services. In addition to the standard root, cloud, and dedicated servers, Fasthosts is one of the very few players in the arena that lets you launch managed stacks and ready-to-use apps on the CloudNX platform for cost- and scale- efficiency. Dedicated server users will also get free SSL certificates and tools to control their online performance end to end. In terms of security features, Fasthosts safeguards your data and applications with Private Networks, Firewalls, VPNs, SSL certificates, and full server backups. 
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