Capacity optimization is a general term for technologies used to improve storage use by shrinking stored data.
Different methods for selecting data windows include 4KB blocks to full-file comparisons known as single-instance storage (SIS).
Capacity optimization generally refers to the use of this kind of technology in a storage system.
[2][3] Commercial implementations of capacity optimization are most often found in backup/recovery storage, where storage of iterating versions of backups day to day creates an opportunity for reduction in space using this approach.
[4] Capacity optimization through sensing threshold adaptation for cognitive radio networks (https://doi.org/10.1007%2Fs11590-011-0345-8)