duplicity: error: no such option: --exclude /proc

Hi Everyone,

I'm working on Debian 12/Bookworm. I am trying to take a backup using
Duplicity 0.8.22. The backup script is located at
<https://github.com/weidai11/website/blob/master/systemd/bitvise-backup#L184>.

When the script runs it produces an error:

  Usage:
    duplicity [full|incremental] [options] source_dir target_url
    duplicity [restore] [options] source_url target_dir
     ...
    duplicity: error: no such option: --exclude /proc

Here are machine details:

    # command -v duplicity
    /usr/bin/duplicity
    # duplicity --version
    duplicity 0.8.22

    # lsb_release -a
    Distributor ID: Debian
    Description:    Debian GNU/Linux 12 (bookworm)
    Release:        12
    Codename:       bookworm

The script used to work. I don't recall any recent changes.

Does someone see anything wrong with the script?

Thanks in advance.

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