| http://www.w3.org/ns/prov#value | - According to an embodiment of the present invention, in a system including plural sites, data are duplexed and are stored in plural storage areas of a first site, content of data update to a first storage area of them is transferred to a second site by a synchronous remote copy, and content of data update to a second storage area of them is transferred to a third site by an asynchronous remote cop
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