the archive download is resumable.
of course as long as you don't change the content of the folder, because it would change the archive itself.
Resuming the download failed for me...
I'm testing with a 13GiB folder.
1st test was with FF2 internal download - 2 tests: download stopped after 480MiB, a few bytes more or less... just disconnected and 'done' LOL
2nd test was with Free Download Manager - failed completely (unknown network error)
3rd test is with Getright (still running) - when I pressed Pause to temporarily hold the download and then resumed, Getright told me that it 'could not find the file on this server'
4th test is with latest stable wget 1.10.2 - running great but resuming not tested yet.
So far so good...
MarkV
P.S. Second test with Getright was O.K., even resuming. Must have been a SNAFU with my system, don't know...