wget

wget -brxc -nc -nv -nH -o download.log -l 0 ‘ftp://link’

-b:    background
-o:     output log messages
-r:     recursive download
-x:     create folders
-c:     continue any partially downloaded files
-nc:     “no clobber” – skip files that already exist
-nv:    non-verbose, but not as quiet as ‘-q’
-nH:    Don’t prefix the downloaded folder structure with the host name
-l:    recursion level, 0=infinity