I read on wiki it says that you can only backup 100 key of Bitcoin-QT.. if you have more then that some of the Bitcoin would be lost..
Can anybody explain and probably come out with a solution if I want to have 110 keys? If you are really curious you can ask me why I need so much key
Without a link to this wiki page, you certainly misread it. There is a pool of keys, which defaults to 100 keys. Bitcoins don't get lost, but you need to make another backup after refilling the pool because now you will be receiving keys from this pool which you don't have a backup yet. You need "so much key" because it is how the client works, you get new ones on completed transactions.
If you want a pool of 110 keys, pass -keypool=110.