bugs: investigate backup script logs

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From root@bugs.nyc1.psf.io  Thu Jul 25 19:00:02 2024
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Subject: Cron <root@bugs> /usr/local/backup/python-bugs-data/scripts/backup.bash
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Date: Thu, 25 Jul 2024 19:00:02 +0000 (UTC)

Host key verification failed.
Fatal Error: Truncated header string (problem probably originated remotely)

Couldn't start up the remote connection by executing

    ssh -i /etc/backup/.ssh/id_rsa_python-bugs-data -C python-bugs@backup.sfo1.psf.io rdiff-backup --server

Remember that, under the default settings, rdiff-backup must be
installed in the PATH on the remote system.  See the man page for more
information on this.  This message may also be displayed if the remote
version of rdiff-backup is quite different from the local version (2.0.5).