AWS Certified Cloud Practitioner

Explanation

S3 Versioning is the most cost-effective solution for this requirement because:

• Automatic version tracking: When versioning is enabled, Amazon S3 automatically preserves all versions of an object, including overwrites
• Cost-effective: You only pay for the storage of the versions you keep, without additional backup service costs
• Simple restoration: You can easily restore previous versions by copying them back to the current version
• Built-in feature: No additional services or complex configurations required

Why other options are less cost-effective:

• AWS Backup: Involves additional service costs and complexity
• Maintain copy in another S3 bucket: Doubles storage costs and requires manual management
• Cross-region replication: More expensive due to data transfer costs and additional storage

S3 Versioning provides the required protection against accidental overwrites at the lowest cost while maintaining simplicity.