Cloud based Business Process Management (BPM) systems have provided SMEs with BPM in a pay-per-use manner. Previous work has focused on looking at cloud based BPM from the perspectives of distribution of data, activity or/and process engine and related issues, such as scalability of system, security of data, distribution of data and activities. To achieve business agility, business process collaboration needs to seamlessly connect local BPM systems and cloud based BPM systems. In this paper we look at BPM in the cloud from a user perspective: how can they support the fast pace of change of business collaborations and how to determine a resilience of a cloud based BPM solution. The paper proposes a distribution solution in which the shared process model can be discovered at the design time from a process repository, and adapted to local needs. At run-time the selected collaborative process model provides a global view, but is executed by multiple mashup engines of the participating parties. A real world case is used to explain our design. Collaborative processes for incident notifications are built to work across different organizations. Resilience of the solution are analysed accordingly.