With all my backup stuff on it, about 120 gb worth

I did it accidentally while I was installing Windows, I nuked the wrong partition by mistake (still had the backup drive plugged in). Fortunately I realised what I'd done before I formatted it, but the partition record is gone.

It was an NTFS (formatted by XP) partition. I've tried sector editing it, but can't seem to find the backup partition table sector (which I gather they are supposed to have). I have run a full scan on it using some uneraser program, it found an NTFS data sector at #63 but when I looked at it it was blank

Any ideas on how I can restore the partition table?