SaaS Deployment Models Compared: Multi-Tenant, Single-Tenant, BYOC, and Self-Hosted

SaaS delivery models have evolved to accommodate data residency and compliance requirements, driven by regulations like GDPR and sector-specific laws in various countries, prompting vendors to offer four main deployment models: multi-tenant SaaS, single-tenant SaaS, bring-your-own-cloud (BYOC), and self-hosted. Multi-tenant SaaS, the most common form, involves shared infrastructure among customers, while single-tenant SaaS offers isolated stacks for each customer, often at a higher cost. BYOC allows the vendor's application to run within the customer's cloud, ensuring data remains in the customer's jurisdiction, and is increasingly popular among enterprises with strict data residency needs. Self-hosted solutions provide maximum control, with the customer responsible for all operations, but are costly to maintain. Each model presents trade-offs in terms of cost, operational burden, security, and upgrade velocity, and the choice depends on factors like compliance requirements, operational capacity, and company growth stage.

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