There are provided a data archiving method and system, which can process primary archiving capable of rapidly searching for compressed and stored data by compressing and storing, in a table of a database or another database, at least some of data stored in the database included in a target system, and can process secondary archiving for data for which search is no longer requested or for which a search request is low by storing at least some of the data compressed and stored in the table in the form of a file according to a preset condition.