File storage ensures tenant data is safely persisted, while content delivery ensures fast, secure access across regions. This chapter explains storage strategies, CDNs, lifecycle rules, per-tenant isolation, compliance, and AI-specific file handling. Applied examples show how to evolve your Todo List SaaS from simple Supabase storage to enterprise-grade S3 with CDN acceleration and compliance controls.

1. Storage Strategies

Types of Storage

• Object Storage: S3, GCP Cloud Storage, Azure Blob — best for files, images, backups.
• Block Storage: EBS, Persistent Disks — best for DB volumes.
• File Storage: EFS, NFS — best for shared file systems.

Best Practices

• Use object storage for tenant uploads.
• Enable versioning for recoverability.
• Apply lifecycle rules for cost optimization.
• Encrypt files at rest and in transit.

2. Content Delivery Networks (CDNs)

Tools

• Cloudflare / AWS CloudFront / Akamai / Fastly → CDN acceleration.

Best Practices

• Cache static assets (JS, CSS, images).
• Geo-distribute content for low latency.
• Use signed URLs for secure delivery.