sudo cp /etc/ssh/sshd_config /backup/sshd_config.baksudo cp /etc/passwd /etc/shadow /backup/sudo cp /etc/group /backup/tar打包用户目录（如/home/username）：sudo tar czvf /backup/home_user.tar.gz /home/usernamecron定时执行备份，例如：#!/bin/bash
tar czvf /backup/sftp_backup_$(date +%Y%m%d).tar.gz /etc/ssh/sshd_config /home/sftpuser
sudo cp /backup/sshd_config.bak /etc/ssh/sshd_configsudo systemctl restart sshsudo tar xzvf /backup/home_user.tar.gz -C /sudo chown -R username:group /home/username-i 私钥路径）替代密码。
