No more contacts on my iPhone 4 after failed Backup via iTunes while updating the device from 4.1 to 5.1.1. What to do to get the contacts back?

The iTunes data on the computer my iPhone was firstly connected and configurated with has been deleted.
I was looking for an opportunity to update my iPhone to the newest iOS software (since it was on 5.0) without erasing all
the data saved on my mobile. But that time I did not know that all data will be erased when upgrading a device
a complete version (like from 3.0 to 4.0 or 4.0 to 5.0) and then it happened. Several hundred business contacts of mine has
been erased and cannot be reset. All functions except the phone/message contacts are unimportant now.
MOST IMPORTANT: I connected my iPhone with a new MacBook, updated iTunes to 10.6.3 (current version) and synced my
mobile with it. Data will be erased if updating on an unknown computer (for iOS device) where no data which are on my iPhone are saved.
Unfortunately, the instructions at iTunes Support were helpless because during the important backup for resetting all datas has been
interrupted with the following window:
Backup not possible
There are not enough space on the iPhone left to finish the backup.
It has never continued and since then all data has been erased.
I would be incredibly glad if anybody could give me at least a tip to do something.
Now I am stucking in very serious trouble.
Thanks so much in advance!

So you have business contacts that were lost... do you not have these on a Database in some shape or form? Sounds like you need to invest in a RAID1 backup setup for your computer so you dont have this issue in the future.
As for repairing your problem, sounds like you are going to need to start from scratch at this point or if the data is still on your phone look into a program that can take the information from the phone onto iTunes.

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