Network Attached Storage devices store your most valuable data yet are often the least protected. This 2026 guide covers Synology, QNAP, and WD NAS systems. Synology DSM 7 offers automatic security advisor, firewall, and 2FA. QNAP has faced serious attacks including Deadbolt ransomware — install Security Counselor immediately. WD My Cloud devices require special attention with documented unauthenticated remote access vulnerabilities. Universal recommendations: strong passwords, 2FA, automatic firmware updates, encrypted volumes, and offline backups. Our guide includes step-by-step configuration walkthroughs.