用批处理实现文件备份器V2.3

echo           │                                                        │
echo           │         本程序能把指定文件在指定时间内备份到指定位     │
echo           │                                                        │
echo           │    置。请把要备份的文件(或文件夹)拖曳至本窗口(推荐     │
echo           │                                                        │
echo           │    做法)，或者手工输入需要备份文件的绝对路径或相对     │
echo           │                                                        │
echo           │    路径(请勿输入非法符号)，然后回车确认。              │
echo           │                                                        │
echo           │        自动完成文件名请按TabShift+Tab，可多次选择。   │