We use Australian web Hosting with 99.99% up time guarantee for non scheduled downtimes
The standard hosting package comes with a 2 hour hardware replacement.
http://www.digitalpacific.com.au/hosting/dedicated-hosting/dedicated-servers/
We check that our custom websites and content complies with http://www.w3.org/TR/WCAG and checked with http://achecker.ca/checker
Accessibility checks are built right into the WYSIWYG text editors and validation messages are given when known issues are detected in the site.
Our custom sites comply with WCAG 2.0 AAA. There is no need for alternative "accessible" versions of the custom sites as we do not use or recommend the use of unfriendly technologies such as flash or Java applets.
On each save of a component validation is performed. Menu links to pages are always synchronized.
External links (not under the control of the CMS) are scanned using http://validator.w3.org/