I backed up my Wallet on dropbox,though, good idea?
If it's encrypted it might make sense, if it's unencrypted it's a
terrible idea!
This would mean dropbox could freely access your wallet, and even if you assume they are honest, dropbox is also known for not being great security-wise: they could be hacked and your wallet stolen anyway.
If you put it there unencrypted, I suggest you to create a new wallet, and send all the coins from the old one to the new one, since the old one has to be considered compromised.