If we don't have a POST_COMMANDS_INCOMPLETE then POST_COMMANDS_FAILURE
will trigger. This may be a bit misleading as we are doing backups of
live systems and it is almost expected that a file will change or
disappear during backup. Instead, we report backup as "up" with a
message that the backup was incomplete.
We need to use ':' instead of '=' in yaml for environment variable
bindings.
Spurious tab where it should be all spaces
Rename variable mail-from to mail_from to align with existing code style
Nit: change email addresses