It's not ideal for your encrypted db to leak because, should you mistakenly leak your master password (which can happen simply through a keylogger for example),

It's not ideal for your encrypted db to leak because, should you mistakenly leak your master password (which can happen simply through a keylogger for example), all the contents are now at risk. However, something like Google Drive is fine. Trust Google engineers to secure your data. Dropbox also fine if you don't like Google.