Just write a systemd unit. These commands are not any easier to support and are far worse from the purely technical point of view. You'll get:

- startup only when the network is up

- proper logging

- automatic restarts on failure

- optional protection for your ssh keys and other data if there's a breach (refer to `systemd-analyze security`)

Run:

  $ systemctl --user edit --full --force rclone-ftp.service

this opens a text editor; paste these lines:

  [Unit]
  After=network-online.target
  Wants=network-online.target

  [Install]
  WantedBy=default.target

  [Service]
  ExecStart=/usr/bin/rclone --your-flags /directory

and then enable and start the service:

  $ systemctl --user enable --now rclone-ftp