After the proposed fix I get a different error:
Something is wrong with the backup: ERROR 23 CommandLineError
. CommandLineError: Wrong number of positional args for 'collection-status', got 11
. Expected 1 positionals from ['/root/.ssh/id_rsa_miab', '-p', "22'", '"/usr/bin/ssh', '-oStrictHostKeyChecking=no', '-oBatchMode=yes', '-p', '22', '-i', '/root/.ssh/id_rsa_miab"\'', 'rsync://finkelstein@storage.shipilev.net:22//home/finkelstein/mail'].
. Enter 'duplicity --help' for help screen.