Final answer:
Using the side of the backhoe bucket in a sweeping motion is not advisable while filling in a trench.
Step-by-step explanation:
Using the side of the backhoe bucket in a sweeping motion while filling in a trench is not advisable.
The side of the bucket is not designed for pushing material and may not provide efficient compaction of the soil.
It is recommended to use the bucket in a vertical position to properly fill in the trench and compact the soil using the bucket's weight.