when apple aapl debuted the iphone x a 10th anniversary edition of the iphone in october 2017 overwhelming initial demand for the phone created a weeks long backlog on pre orders apple was forced to delay shipments to late november and then again to december for customers pre ordering the phone upon launch many criticized the backlog as an example of poor sales forecasting by apple which saw a similar situation happen when the firm debuted its apple watch product in 2015 
the 2008 housing crisis resulted in a backlog of foreclosures in which lenders had large inventories of residential properties they needed to sell and get off the books with homes going into foreclosure at a much faster rate than usual lenders did not have the capacity to process all the foreclosures in a timely manner in many cases these lender backlogs resulted in situations where delinquent borrowers were able to remain in their homes for several years without making any mortgage payments the housing recovery did not begin in earnest until such backlogs were mostly cleared 