GMT data server mirror has been run in Singapore by National University of Singapore,
Dowaload@NUS (https://download.nus.edu.sg/index.html download@nus.edu.sg) is currently hosting the mirror by pulling daily. Hope this server help scientists in Southeast Asia with a fast data downloading speed.
I just requested Download@NUS (https://download.nus.edu.sg/index.html download@nus.edu.sg) for hosting GMT data by sending them an email last week. I think you can also contact Download@NUS by the above email. I will appreciate it if you could also cc to me (coreman.seism@gmail.com).