The fourth quarter is when most small businesses are busiest, and when attackers know your team is distracted. A few focused reviews now can prevent a crisis later. This checklist is designed for leadership and operations teams who want to confirm their security posture before the year-end push.

Review access before the rush

Start with the accounts that matter most. Confirm that multi-factor authentication is enabled on email, banking, payroll, and any system that holds customer or financial data. Remove accounts for people who have left the organization or changed roles. Check for shared or generic logins and replace them with named accounts wherever possible.

Verify your backups

Backups are only useful if they work. Confirm that critical data is covered, including Microsoft 365 or Google Workspace mail and files. Run a test restore for at least one important file or mailbox. If your backup provider offers immutability, make sure it is turned on.

Patch and update priorities

Operating systems, browsers, and business applications should be current. If something cannot be patched, document why and what compensating controls are in place. Outdated software is one of the easiest ways into a network.

Prepare for phishing and payment fraud

Holiday seasons bring spikes in phishing, fake invoices, and vendor impersonation. Remind your team to verify payment changes by phone, not email. Confirm that finance processes require a second set of eyes on wire transfers and new vendor setups.

Check incident response contacts

Make sure your incident response plan lists current phone numbers for your IT provider, cyber insurance carrier, attorney, and bank. Print a copy. If your primary contact is unavailable, name a backup.

Plan for downtime

Identify the three to five systems your business cannot operate without for more than a day. Confirm how quickly each can be restored and who is responsible for making that call.

Key takeaways

  • Confirm MFA and remove stale accounts before the busy season.
  • Test a backup restore and verify immutable backup settings.
  • Patch critical systems and document anything that cannot be updated.
  • Brief your team on holiday phishing and payment fraud.
  • Update incident response contacts and print the plan.