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I am looking for a backup software that detects if my USB-Hard drive is connected and then starts a backup.

Windows 7 can backup on external hard drive, but if the hard drive is not connected it just skips the backup.

Is there a program or script that helps me?

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I had an HP external drive that came with software to automatically back up when plugged in (though it only backed up data files). I currently use a Seagate drive with ShadowProtect software that can be programmed to attempt the backup several times a day. If the drive is not connected the backup is skipped, but the next backup will take care of things. (This is on Vista.) – Daniel R Hicks Jan 1 '13 at 21:22

I didn't use this much on Win7 (just once, it works) but used this more often on WinXP laptop & this worked perfectly for me for usb keys/drives:

Does what it says on the tin, free for home use & you can use the setup as described in scripting examples.

You set it to check every X seconds, then it sleeps until execution time, and will not run again unless the app is restarted or the usb drive is reconnected.

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I have not used this software myself and i could not find any free software that meet your requirements. Hope it's what you are after. This program offers a trial period.
Adware has been reported with trial.

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My virus scanner (Anti Vir) detected ad ware in the trial version – Mathias F Feb 24 '11 at 20:48
re-ran with mal-bytes and sec-essentials and got nothing, but sorry anyway.Will edit. – mic84 Feb 26 '11 at 14:49

I use Crashplan. It has a free option, which you can use to backup to an internal/external drive, or to another computer, either in your local network or not. When the backup destination is not available, the backup will not be executed. To be clear, I don't see how this would be different from the Windows Backup.

I have the family pack, pay $12 per month and can backup any computer that I control with unlimited storage. The only limit is upload speed. Then I have a local server at my home, which I use as second backup. I backup several family computers to this computer. Another plus: it works on Windows, Linux and OSX. The only catch: there is only one key to encrypts backups, so whoever has that plus the CP login, can open all backups.

You can backup to a friends computer for free, if he/she has CP as well. They can generated a code, give that to you, and vice versa. If you encrypt the backup, you cannot see the contents of the backup.

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