| http://www.w3.org/ns/prov#value | - SUMMARY OF THE INVENTION [0011] One object of the present invention is to provide a file backup technique where backup of files shared on a network can be performed online accurately. [0012] One aspect of the present invention is a method of backing up a file comprising synchronizing a first file to be backed up and a second file which is a copy of the first file to contain the same contents, moni
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