Incoming data is detected as duplicate and is removed, allowing reduction of storage consumption. This is called which of the following?

Single instance storage (SIS) is a specific form of deduplication where multiple copies of an object are replaced by a single copy and pointers, often used in email systems.

In-line deduplication identifies and removes redundant data blocks or files as soon as they are received and before they are written to the storage media. This method significantly reduces the amount of data actually stored, optimizing storage capacity and often improving write performance by reducing I/O.

Hierarchical data storage refers to organizing data across different storage tiers based on access frequency and performance requirements, not a deduplication method.

Post-process deduplication performs the deduplication operation after the data has already been written to disk, meaning it initially consumes full storage capacity before reduction occurs.