If you maintain your repositories in a single folder grouped by org or such this backs them up, not the most efficient

env-backup.sh

# Variables
filename='.env-list.txt'
backupdir='~/Documents/backups__/envfiles'

rm -rf $filename
find . -name '*.env' >> $filename

while IFS="" read -r p || [ -n "$p" ]
do
    if [[ "._" == *"$p"* ]]; then
        echo "Skipping $p"
        continue
    fi
    filename=$(basename "$p")
    dirname=$(dirname -- "$p")
    cleandirname=${dirname:2}
    replacespaces=${cleandirname// /_}
    replaceslashes=${replacespaces//\//_}
    mkdir -p "$backupdir/$replaceslashes"
    cp -R "$p" "$backupdir/$replaceslashes/$filename"
done < $filename

echo "Completed Backing Up .env Files"