This type of backup management provides a continuous on-line backup by using optical or tape
“jukeboxes”, similar to WORMs, (Write Once, Read Many)

A.
Hierarchical Storage Management (HSM).

B.
Hierarchical Resource Management (HRM).

C.
Hierarchical Access Management (HAM).

D.
Hierarchical Instance Management (HIM).

Explanation:
Hierarchical Storage Management originated in the mainframe world where it was
used to minimize storage costs. The HSM name signifies that the software has the intelligence to
move files along a hierarchy of storage devices that are ranked in terms of cost per megabyte of
storage, speed of storage and retrieval, and overall capacity limits. Files are migrated along the
hierarchy to less expensive forms of storage based on rules tied to the frequency of data access.
File migration and retrieval is transparent to users. Two major factors, data access response time
and storage costs determine the appropriate combination of storage devices used in HSM. A
typical three tier strategy may be composed of hard drives as primary storage on the file servers,
rewritable optical as the secondary storage type, and tape as the final tertiary storage location. If
faster access is required, a hard drive can be considered as an alternative to optical for secondary
storage, and WORM (Write Once, Read Many) optical can also be implemented, in place of tape,
as the final storage destination.