通过Github的Actions创建定时执行脚本，实现文件同步下载及长期副本保留。

示例代码：

name: Download and Archive Wallpapers

on:
  schedule:
    - cron:  '12 7 * * *' #北京时间 15:12
    - cron:  '12 16 * * *' #北京时间 00:12（次日）
    - cron:  '12 0 * * *' #北京时间 08:12
  workflow_dispatch:     # 允许手动触发

jobs:
  download-and-archive:
    runs-on: ubuntu-latest
    
    permissions:
      contents: write    # 授予写入权限
    
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
      with:
        persist-credentials: true  # 保持推送凭证

    - name: Create archive directories
      run: |
        mkdir -p archive/cn
        mkdir -p archive/en

    - name: Download Chinese version
      run: |
        # 下载中文版文件
        curl -s -o bing-wallpaper-cn.md https://raw.githubusercontent.com/niumoo/bing-wallpaper/refs/heads/main/zh-cn/bing-wallpaper.md
        
        # 创建带日期的中文版副本
        TODAY=$(date +'%Y-%m-%d')
        cp bing-wallpaper-cn.md "archive/cn/bing-wallpaper-cn-$TODAY.md"

    - name: Download English version
      run: |
        # 下载英文版文件
        curl -s -o bing-wallpaper-en.md https://raw.githubusercontent.com/niumoo/bing-wallpaper/refs/heads/main/bing-wallpaper.md
        
        # 创建带日期的英文版副本
        TODAY=$(date +'%Y-%m-%d')
        cp bing-wallpaper-en.md "archive/en/bing-wallpaper-en-$TODAY.md"

    - name: Clean up old archives
      run: |
        # 删除180天前的中文归档
        find archive/cn/ -name "bing-wallpaper-cn-*.md" -type f -mtime +180 -delete
        
        # 删除180天前的英文归档
        find archive/en/ -name "bing-wallpaper-en-*.md" -type f -mtime +180 -delete

    - name: Commit and push changes
      env:
        GH_TOKEN: ${{ secrets.PAT }} # 需在项目设置中添加名PAT的TOKEN
      run: |
        git config --local user.email "your account mail address" # 需改成自己的
        git config --local user.name "GitHub Actions Bot"
        git add bing-wallpaper-*.md archive/
        git commit -m "Auto-update: Latest wallpapers (CN+EN) + Archives" || echo "No changes to commit"
        git push https://${{ env.GH_TOKEN }}@github.com/yourname/yourproject.git # 需改成自己的用户名及项目名