When an excavator backs up and hits a log, the consequences will depend on the size and type of log as well as the speed and force of the impact. In some cases, the log may be small enough to be pushed aside or broken apart by the excavator's weight and force, causing little or no damage to either the machine or the log.

However, if the log is larger and more solid, it could cause damage to the excavator's equipment, such as the blades or tracks, or even cause the machine to become stuck or tip over if it's not properly balanced. Additionally, if the log is a valuable hardwood, it may be damaged or devalued by the impact, causing financial losses. As with any situation involving heavy machinery, it's important to exercise caution and be aware of one's surroundings to avoid accidents and minimize potential damage.