I need a software (Windows 7 32bit) to help me in this process:

1. I have my documents, music, video clips, movies, pictures in my hard disk. These will not be scattered around the system. But will be inside C:\Senthil\

2. At the end of every week, I want to plug in an external hard disk and run a software that should make sure whatever is inside C:\Senthil\ is also present in the external disk. Files deleted from C:\Senthil\ should be deleted there, and new files should be copied etc... at the end of the process, every bit inside the source folder in my internal disk should be inside my external disk.

A couple of important requirements and points:

• I do NOT need multiple versions or historic versions. I don't need the previous versions of my files. I only want the latest copy to be present in my "backup".

• Incremental backup makes sense. If files were not touched since the last backup, it need not copy.

• The size of my folder will run into GBs and in a year or two will go into TBs. But I will make sure the size of the external HDD is equal to or bigger than my source folder.

• I do not want it to run automatically because when I accidentally delete a file in my source, it will delete the one in the backup (I know this is why we have versioning facilities). I just want to be able to run it manually so that I am in control of when the backup is made and what is backed up and I should be able to pick something from the backup and restore it to the source folder in the above situation.

Is there any software that will let me do exactly this? I don't want any other "smart" facility of the software to interfere with this process. I know what I want and the software can keep its smartness to itself :D

The main reason I am asking this question is, I am a software developer and I can write this software myself. But I am a little constrained by time at the moment and I want to know if there is an existing program that can do this.

Kindly don't worry about earthquakes or fire or snowstorms and bring up the "in case of a natural disaster your backup will also be in the damage zone and will be lost" argument because:

1. I will have bigger things to worry about than my holiday memories.
2. I don't think I will digitally store any life-ruining documents.
3. This backup is only to avoid the inconvenience of obtaining a new copy of stuff that I have. Not to protect them against the end of the world.
4. I am more worried about power surges in my area frying my system, hard disk failure, children who merrily hit Delete or teens who hit Shift + Delete or myself getting a little careless at times!

In short: Is there a file/folder syncing software that listens to what I say and doesn't try to act smart?

Please forgive me if I sound arrogant :)