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In Software-as-a-Service cloud delivery model, a hosting center deploys a Virtual Machine (VM) image template on a server on demand. Image templates are usually maintained in a central repository. With geographically dispersed hosting centers, time to transfer a large, often GigaByte sized, template file from the repository faces high latency due to low Internet bandwidth. We exploit the presence of this commonality among template files, ETSIT-CO algorithm is proposed to determine the distribution of patched and template files in cache, that computes a cache composition with the objective of minimizing transfers from repository, thereby reducing request service time. Our simulation experiments show significant gains when using patch based caching approach, when compared to standard caching technique of storing template files. Patch-based caching using ETSIT-CO shows over 90% improvement when compared to ETSIT-CO generated selection for template only caching in our prototype testbed implementation.