rigid insulation
Go to one of the big box stores (ie Home Depot) and get yourself some rigid insulation. They come in 24x96" pink sheets and are 1 1/2" up to 2" thick. They make great backstops. They don't get damaged from rain, arrows come out fine without residue and are fairly inexpensive. You may need to double them up depending on what your are shooting (field points vs. broadheads).
But since you have an acreage I would just go and get some hay bails and pile those up.
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