用批处理实现文件备份器V2.3

echo     ║    盘的当前路径来处理，而不是指定盘的根目录。比如：假设系统安装    ║
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echo     ║    在C盘，在路径中只输入 C: ，则并不会认为是C盘根目录，而是C盘的   ║
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echo     ║    当前路径，默认为"C:ducuments and settings当前用户名"；        ║
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echo     ║        4. 如果输入的路径不带盘符，则作为相对路径处理；             ║
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echo     ║        5. 本程序工作原理为：通过比较备份后文件与源文件的时间早晚   ║
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