Many businesses today are delivering applications to users as an on-demand service. This reduces the cost of application management and can improve application and data security. Citrix® XenApp™ empowers companies to achieve these results as well as other benefits. Challenges do however remain around maintaining application availability and protecting the integrity of your data. This white paper explores what availability really means, and how availability correlates to RTO and RPO baselines. The concept of levels of availability is introduced, which is an industry analyst driven definition for multiple levels of availability used to protect different applications from downtime to fulfill SLA commitments. XenApp and XenApp infrastructure components are analyzed to determine how they can be protected so you can achieve your SLA commitments. Marathon Technologies everRun® software is introduced with XenApp deployment samples depicting how everRun can be used to protect XenApp from downtime and data loss.