Online wallets? Too many horror stories.
I'm going to second this. Online wallets are far too risky. Even with a legitimate site, it can be hacked, an employee can go rogue, etc. You're basically opening yourself up to a lot more risks than you would be otherwise. Unlike cash, which is FEDERALLY insured when in a bank, your BTC, if stolen/hacked/etc. is gone forever. Always keep it in your own possession at all times.
True. It is better to keep your own funds yourself rather than trust other third-party sites to take care of them for you. Multiple saving of the files of your wallet is a lot safer than letting other people--even if they are a legitimate business or entity within the society--handle your money for you.