I'm not mad, just cautious.
I don't know what percentage you get for promoting this tool, but when I click the download button it displays a fat "pay €19.95 to download" button. While it may be free, inexperienced users might be tempted to pay that "low price" just as they buy free OpenOffice.org for €90 from some site that managed to be SEOd to #1 on Google.
Even if you are not advertising for this tool, it's still a much better practice to keep backups than to try and undelete the wallet. It may be overwritten already or corrupted or just plain lost beyond recovery.
Then, 10 BTC is not small money imho. Trusting an USB stick with ~$140 is not exactly smart, seeing how often especially cheap models tend to corrupt without prior notice. I was "concerned about backing up" the minute I had a single coin in my wallet.
No problem that you are new to Bitcoin, but you should have read some info about it in the Wiki, specifically the prominently promoted article Securing your wallet
and you would have known that you have no actual coins in your wallet, "just" the private keys to spend them so your wallet doesn't change with each transaction (unless the client generates a new receiving address in the process).
The plus side of storing your wallet encrypted on some cloud server (I use Dropbox): I can access from every PC in the world, even if all my machines would break and I somehow wouldn't be able to get to work.