In terms of archiving. an importance of the Web is more increasing. Since the Internet has been popularized. many archivists have made efforts to preserve informational. cultural. and evidential values of the Web. Information resources on the Web raise archival issues that are significantly different from issues of preservation for tangible materials, because they are based on unique characteristics of the Web. One of issues is about a technical aspect which is based on technical architecture of Web. Another important issue is related to legal problems including copyright, authenticity and so on. In this context. it is essential to understand technical and legal characteristics of the Web. A purpose of this article is to review technical and legal aspects of Web archiving and to find an agenda for development of Web archiving.