How to take backup weekly in C#?

Hi all,

i am developing backup app in C# and i want to integrate below functionalities in it :-

1.it should take backup every appropriate day of week(Monday ,Tuesday ,etc.).

2.if some how backup is skipped on appropriate day like Monday (Due to system shut down),so if we start machine on Tuesday it should not take backup on Tuesday, it should be take backup accordingly on next coming Monday.

please tell me how to achieve this.

Thanks.

SumitK