In order to install the JobRoller theme, you need to have your own hosting account with WordPress installed on it. AppThemes does not offer hosting services, so your installation is independent of us in that sense. User data and jobs entered directly onto your site are stored in the database which is part of your own hosting provider account which only you (and technically, your host) should have access to. The database belongs to you as per any terms of your hosting provider. If you are using feeds such as Indeed.com, or SimplyHired, those specific jobs are dynamically displayed, so the data itself is never stored in your database. Thanks.