In a world that syncs by default, your data rarely lives in one place—it's copied across apps, cloud providers, backups, and content networks, often crossing borders. That expands who could potentially see it: the service itself, infrastructure vendors, third‑party processors, and, with proper orders, law enforcement. Jurisdiction matters because laws like the U.S. CLOUD Act and EU GDPR shape access and obligations, so choose region‑locked storage and review government‑request and data‑location policies. If content isn't end‑to‑end encrypted (E2EE), assume the provider could read it despite "encrypted at rest" claims. Prefer E2EE for chats, files, and passwords to keep only you and intended recipients in the loop. Strengthen defaults to shrink exposure: enable passkeys or 2FA, set sharing to invite‑only, disable auto‑sync for sensitive folders, and use expiring links. Minimize what you upload, strip photo location data, and pick local‑first or E2EE apps for personal items. At home, use a password manager, full‑disk encryption, automatic updates, the 3‑2‑1 backup rule, quarterly permission reviews, and routine pruning of old cloud data and shared links. At work, separate identities, keep data in approved apps, enforce named‑person sharing and least‑access by default, schedule deletion of stale files/recordings, and document region, owner, and retention. Privacy by default turns safer choices into the easy choices—without giving up the convenience of sync.