Backlog
A backlog is the total volume of confirmed orders or jobs a business has received but not yet delivered or completed. It shows whether fulfillment capacity is keeping pace with incoming demand.
A backlog is the total volume of confirmed orders, jobs, or commitments that a business has received but not yet fulfilled or completed. It exists in every project-based and order-driven business - from a construction contractor with four jobs awarded and two not yet started, to a promotional merchandise distributor with 30 active orders in various stages of production. A backlog is not inherently a problem. It becomes one only when its size exceeds what the business can realistically deliver within the timeframe customers expect.
What Your Backlog Size Tells You
A growing backlog usually signals strong demand - more work is coming in than is being completed in the same period. For a trade contractor, a backlog of several weeks is often a sign of healthy pipeline activity without meaningful delivery risk. For a promotional merchandise distributor, a growing multi-week backlog starts to affect customer relationships if lead times are not communicated clearly when orders are confirmed.
A shrinking backlog means fulfillment is catching up with demand - which is good for customers in the short term, but a sustained decline over several weeks can indicate that new work is slowing down. Tracking the ratio of backlogged work to total orders received gives a clearer picture than looking at either number in isolation.
Sales backlog can be expressed as a ratio: divide backlogged orders by total orders received in the same period. A ratio of 0.1 means one in ten orders is backlogged. A ratio that trends upward over several months is worth investigating - it often points to a capacity constraint or a quoting pace that is converting more work than operations can absorb.
Backlog as a revenue indicator
A backlog also represents confirmed future revenue - work that is committed but not yet billed. For businesses using milestone or stage-based invoicing, the backlog value indicates how much income is already in the pipeline before any new orders arrive.
Backlog vs. Backorder: Two Terms That Get Mixed Up
These terms are related but refer to different situations, and the operational response to each is different.
A backorder arises when a specific product cannot be shipped or delivered because it is out of stock. A backlog is a queue of work or orders waiting to be processed - stock or materials may be available, but capacity (time, labour, equipment, installation slots) is the constraint.
A plumbing contractor with five booked heating installations but only three engineers has a backlog. A promotional merchandise distributor who cannot ship a client's garment order because the blank goods have not arrived from a supplier has a backorder.
Because the root cause differs, so does the fix. A backorder problem is a supply chain problem - chase the stock. A backlog problem is a capacity or scheduling problem - adjust workflow, sequence jobs differently, or add resource. Treating one as the other typically makes things worse, not better.
Zigaflow's jobs and orders feature gives businesses a live view of their full backlog - every confirmed order, its current status, and what remains outstanding - without maintaining a separate spreadsheet.