I think this is what you want (from man amanda):
I imagine this comes from the fact that in disklist, every samba-related line begins with the same hostname (that is the hostname of the backup server).
Aren't there a way to paralellized those samba backups ?
maxdumps int
Default: 1. The maximum number of backups from a single host
that Amanda will attempt to run in parallel. See also the
inparallel option.
Note that this parameter may also be set in a specific dumptype
(see below). This value sets the default for all dumptypes so
must appear in amanda.conf before any dumptypes are defined.
