... and unbreak last commit removing delay (69352c90).
This requires a change in configuration syntax. Change this...
comment="default:br-local, alt:br-guest"
to...
comment="default=br-local, alt=br-guest"
Currently backup to MikroTik cloud is pretty unreliable and script can
not catch errors at runtime. Looks like this does not change any time
soon (Ticket#2019052022003204).
So let's just split off the cloud backup to make sure email backup works
as expected.