vi /etc/systemd/system/backup.service

[Unit]
Description=Backup Files
After=local-fs.target

[Service]
Type=oneshot
User=root
Group=root
ExecStart=/bin/bash -c "mkdir -p /mnt/raid10/db && \
                       mkdir -p /mnt/raid10/cipher && \
    if [ ! -e /home/crypto/db ]; then \
        ln -s /mnt/raid10/db /home/crypto/db; \
    fi; \
    if [ ! -e /home/crypto/cipher ]; then \
        ln -s /mnt/raid10/cipher /home/crypto/cipher; \
    fi; \
                       /usr/bin/rsync -av /home/rsync/mysql-raid/ /mnt/raid10/mysql/ && \
                       /usr/bin/rsync -av /home/rsync/yangguang-raid/ /mnt/raid10/yangguang/ && \
                       /usr/bin/rsync -av /home/rsync/db/ /mnt/raid10/db/"
ExecStartPost=/bin/rm -f /etc/systemd/system/backup.service

[Install]
WantedBy=multi-user.target

systemctl daemon-reload

systemctl enable backup.service