Domains, DNS, hosting, certificates, backups and monitoring all contribute to a dependable online service.
A website depends on several connected services. The domain points visitors to DNS records; those records direct requests to hosting; the hosting environment runs the site and serves its files. Certificates protect connections, while backups and monitoring help teams recover from problems and spot failures.
Key considerations
Keep an inventory of providers, account owners and renewal dates. Document changes to DNS, hosting and application settings, and keep a restorable backup separate from the live site. Test recovery rather than assuming that backup files are usable.
Putting it into practice
Treat infrastructure as an ongoing responsibility. Review access, updates, performance and alerts regularly, and make sure someone knows how to contact each provider when the site is unavailable.