用批处理实现文件备份器V2.3

echo           │        1.若在每月的某几天备份，请输入从1到31的任意     │
echo           │                                                        │
echo           │    数字，比如1,3,4；若只在每月1号备份，请输入"1，"；   │
echo           │                                                        │
echo           │        2.若在每周的某几天备份，请输入星期几的代码      │
echo           │                                                        │
echo           │    (M,T,W,Th,F,S,Su)；如果指定日期较多，在查看任务     │
echo           │                                                        │
echo           │    列表的时候，日期一栏将用省略号显示；                │
echo           │                                                        │