Direct answer: For a typical small-business website, a documented monthly security-oriented review is a reasonable operational baseline when combined with ongoing monitoring and timely updates. Higher-risk or frequently changing sites may require more frequent automated checks, deeper testing, or professional security review.
Frequency should follow risk
A brochure-style site with few changes has a different risk profile from an e-commerce store, membership system, payment workflow, or site handling sensitive information. More complex systems generally justify more frequent and deeper review.
Run additional checks after meaningful changes
An on-demand check is useful after a migration, major software update, new integration, DNS or certificate change, authentication change, suspected compromise, unusual outage, or other material configuration change.
Monitoring and security checks are complementary
Availability monitoring can reveal that a site is down or responding unexpectedly, but it is not a substitute for a security review. Likewise, a monthly security report does not replace continuous operational monitoring.
Act on findings
The value of a security check comes from remediation. Critical or credible high-risk findings should be investigated promptly rather than waiting for the next scheduled report.
Do not treat a clean report as a guarantee
Security reports represent the conditions and scope observable at the time of testing. They should not be interpreted as proof that no vulnerability exists.