Small business infrastructure has quietly become simple: for most companies, the right answer is a well-configured cloud tenant, managed devices, and almost nothing in a closet.
The pillars are identity (one account per person, MFA everywhere), devices (every machine enrolled in management, encrypted, and patched automatically), and data (files in managed cloud storage with permissions that mirror your org chart — not in email attachments).
What separates a foundation that scales from one that collapses at 30 employees is configuration discipline. Default settings are built for convenience; baseline-hardened settings are built for your survival.
Build it right once, and growth becomes an administrative task instead of a re-architecture.