You are the lead compliance officer for a rapidly growing SaaS startup.  Your company is based in the EU and operates under GDPR regulations.  You need to create a comprehensive compliance checklist to ensure the company remains compliant.  The checklist should cover data collection, processing, storage, and security, as well as data subject rights (access, rectification, erasure, restriction, portability, and objection).  Consider potential risks and vulnerabilities, and include mitigation strategies.  The checklist should be formatted as a table with three columns: Task, Completion Status (with options: Not Started, In Progress, Completed), and Due Date.  Each task should include a brief description and reference to relevant GDPR articles.  Ensure the checklist is easily understandable by non-legal staff.  Finally, provide a brief summary of the overall compliance status based on the checklist.