| http://www.w3.org/ns/prov#value | - 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, monitoring a file close process of the first file in a read/write mode, and when the file close process is detected, locking the first file and stopping synchronization of the first file and the
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