Looking at SafeWallet for Windows:
Your encryption key is never sent to us - Unlike most online services, SafeWallet technology knows how to sync your data without your encryption key. This means your encryption key, i.e., your master password, is never sent to us, making it impossible to access your data for anyone but you!
Now, I know that LastPass store your information on your PC also, maybe, I can encrypt LastPassword folders on my PC! Just in case a Key-logger got onto my PC!