Foundation 10 of 20 · Supply
Supply Risk Management: Backup Suppliers and Safety Stock
One Supplier Is Not a Supply Chain. It Is a Single Point of Failure.
"What do I do when my only supplier runs out?" If one supplier running out would shut you down tomorrow, you have a supply risk, even if they have never missed before. Here is how to manage supply risk with a backup supplier and a small safety stock.
Last Updated: 10/25/2026 · Written by Dr. Paul Borosky, DBA, MBA
The Short Answer
What Is Supply Risk Management?
Textbook Definition
Supply risk management is the identification, assessment, and mitigation of risks that could disrupt the availability of critical inputs, commonly through supplier diversification, backup sourcing agreements, and safety stock.
In Plain English
Supply risk management means listing the things you cannot open without, setting up a second place to buy each one before you need it, and keeping a small extra supply on hand, so one supplier's problem never becomes your closed sign.
Why It Matters
Why Is Buying From One Supplier So Risky?
Most of the time, your supplier delivers, so you never think about what happens when they do not. Suppliers run late, run out, raise prices, close, or get bought. If you buy something essential from exactly one place, their problem becomes your problem the same day.
Buying a critical item from only one supplier is called single sourcing. It is not wrong. It is a risk worth writing down. The fix is a backup source set up while nothing is wrong, and enough stock on the shelf to cover the time it takes to use it.
Signs you have this problem:
- One supplier provides something you cannot operate without.
- You do not know who else sells it.
- You keep one emergency unit, and it is already used.
- You have never asked what you would do if your supplier closed.
- A late delivery has ever forced you to close or turn customers away.
- Your backup plan is "they have never let me down."
What It Looks Like
What It Looks Like When the Only Mill Runs Out
From the Fabled Forest · Chapter 10
Louie Waffles bought every sack of flour from Low Root Mill for twelve years. Then Talon Fire Pizza bought the mill's entire month of flour, up front, at double the price. Grist sent Louie a card: no flour this month. Louie had used his one emergency sack the week before. Waffle Woofs closed.
Doctor Owl had Louie list only the five things he could not open without: butter, coffee, eggs, flour, syrup. For each one, who he bought from, who else sold it, and how much he kept on hand. Every item had a backup except flour.
Grist himself suggested the grain wagon at the desert market. Coarser flour, but good enough. Louie changed the recipe card, built two weeks of safety stock rotated oldest first, and reopened Saturday. Grist went back to selling him three sacks a week. Across the square, Talon's extra flour sat under a tarp, going soft.
Louie's story is Chapter 10 of Operations for Small Businesses, Book 3 of Dr. Paul's Fabled Forest Business School Series.
The Fix
How to Manage Supply Risk in 5 Steps
This takes one afternoon. Do it while nothing is wrong.
List only the things you cannot operate without.
Not every supply. Just the items that, if they ran out, would close you or stop service. Most businesses have five to ten.
Write your current supplier next to each one.
And note whether it is the only place you buy it. Those single-source items are your biggest risks.
Set up one backup supplier for each item, now.
Find them, contact them, and if possible place a small order so you are already a customer. A backup supplier found during a crisis is a scramble.
Set a safety stock for each item.
Enough to cover the time it would take to get more from the backup. If the backup takes a week, keep at least two weeks. Rotate it, oldest first, so it stays fresh.
When you use the safety stock, refill it first.
Before anything else. The most common mistake is using the emergency supply and forgetting to replace it, so the next emergency finds an empty shelf.
Dr. Paul's Insight
A backup supplier is often a little more expensive or a little lower quality. That is fine. It does not have to replace your main supplier. It has to keep you open. Buying a small amount from your backup regularly keeps the relationship warm, so when you truly need them, you are already a customer they know.
Sample: A Critical Supplies Risk Sheet
Only the items you cannot open without. One backup and a safety stock for each.
| Item | Main supplier | Backup supplier | Safety stock |
|---|---|---|---|
| Butter | Local dairy | General store | 1 week |
| Coffee | Coffee wagon A | Coffee wagon B | 2 weeks |
| Eggs | Hen farm | Farm across the creek | 3 days |
| Flour | Low Root Mill | Desert grain wagon | 2 weeks |
| Syrup | Maple stand | Local honey producer | 2 weeks |
Sample for illustration. Rotate stock oldest first, and refill it before anything else when used.
The Shortcut That Costs More
Corner the Supply?
In the book, Talon Fire Pizza, a new shop on the square, keeps showing the forest a faster way. Every one sounds efficient. Every one works for a while. Every one breaks down on the busiest day. Here is the one in Chapter 10.
Buy up everything your competitor needs, so they cannot get any.
Your competitor closes for a week, and their customers walk across the street to you.
You now own more than you can use, sitting somewhere you never planned for, going stale. The supplier will never trust you again, and your competitor has just learned to find a second source.
Win with a better product and a more reliable operation, not by emptying the shelf. And if a competitor ever tries this on you, a backup supplier is your answer.
Watch
Video: How to Protect Your Business From Running Out
Supply Risk Management: Backup Suppliers and Safety Stock
Dr. Paul builds a critical supplies list with backups and safety stock on screen.
From the Book
There Isn't Anybody Else
Chapter 10 · Supply Risk and Backup Suppliers
One Mill, One Mole, One Problem: A Labrador's Empty Sack
"There isn't anybody else," he said. "Grist's the only mill."
"In the forest," said Doctor Owl.
Where did Louie find a second source, and who suggested it? Find out in Chapter 10. Book 3 of Dr. Paul's Fabled Forest Business School Series.
Get the Book on Amazon →FAQ
Supply Risk Questions
What is supply risk?
What is single sourcing?
How many backup suppliers do I need?
What is safety stock?
Keep Going
Related Foundations
Supply risk connects three foundations that keep the doors open when something goes wrong. New to a term on this page? Every one is in the operations glossary.
Written by Dr. Paul Borosky, DBA, MBA, business consultant and author who helps owners build businesses that run on systems. Want help finding the single points of failure in your business? See fractional COO services.
This page is for general educational purposes only. It is not legal, safety, employment, financial, or tax advice. Safety and employment rules differ by place and industry. Dollar figures are illustrations. The Fabled Forest and its characters are fictional. For decisions about your own business, consult a qualified professional.