This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to Cloudsfer.
We've created an account for you. In order to activate your account, please click here:
Thank you for joining Cloudsfer.
The Cloudsfer Team http://www.cloudsfer.com
This e-mail was sent to you because someone entered your e-mail address at http://www.cloudsfer.com. In case it wasn''t you, simply ignore this e-mail. However, if you believe somebody is abusing your e-mail address maliciously, please let us know at email@example.com. We are committed to fight e-mail abuse & spam and we will therefore check into the matter ASAP.