Which of the following can be deployed by a cloud provider to reduce storage costs?

In computing, data deduplication is a specialized data compression technique for eliminating duplicate copies of repeating data. Related and somewhat synonymous terms are intelligent (data) compression and single-instance (data) storage. This technique is used to improve storage utilization and can also be applied to network data transfers to reduce the number of bytes that must be sent

https://en.wikipedia.org/wiki/Data_deduplication