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pcmanfm does some useful things nemo does not do. For example, to backup a file in the directory with pcmanfm simply click the filename, choose "copy" and then choose "paste" from the menubar. pcmanfm will prompt you because the copy has the same filename as the original, and give you the option to rename, in which I simply change the extension to .bak or something like that. This simple task that you can do in Microsoft Windows and in Linux using pcmanfm cannot be done with nemo!