A new README section shows how to run quak backup unattended: log in once
as the job's user, a crontab with a backup every night and --verify on
Sundays, output appended to a log file, and the HOME and XDG_DATA_HOME the
job needs to find the saved session. A table gives each exit code as the
code returns it, and says which failures the next run retries. The
introduction now lists everything the backup keeps for each file. It, the
backup layout tree and the lib.backup() entry say EXIF and XMP are kept for
an image only, and dimensions for a JPEG only.
Judgement call: the --verify run takes Sunday's slot rather than a second
job that night, since an overlapping run would exit 2.
Model: opus-5-5
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