olemus
eksemplare sünkroniseeriv andmete kopeerimine
liiasressurssidele riistvaras või tarkvaras

Wiktionary:
5. (computing) The process of frequent electronic data copying a one database in one computer or server to a database in another so that all users share the same level of information. Used to improve fault tolerance of the system.

ülevaateid
https://en.wikipedia.org/wiki/Replication_(computing)