docs/misc/logging.conf
[loggers]
keys=root
[handlers]
keys=logfile
[formatters]
keys=logfile
[logger_root]
level=NOTSET
handlers=logfile
[handler_logfile]
class=FileHandler
level=INFO
formatter=logfile
args=('borg.log', 'w')
[formatter_logfile]
format=%(asctime)s %(levelname)s %(message)s
datefmt=
class=logging.Formatter