We are very concerned about security. Your survey/response data is stored in a separate database with a separate username/password for each LimeSurvey Cloud instance. The connection of your browser to our servers is also encrypted using SSL. The data inside LimeSurvey is by default not encrypted because it is regularly accessed by the LimeSurvey application (it is not at rest); however, you can configure responses to certain question types to be always encrypted at rest. Moreover, for participant data, you can select certain fields to be always encrypted. Furthermore, we create daily backups of your LimeSurvey data. That data is at rest and encrypted, stored safely on a different drive, but at the same hosting location.