You try FTP. It fails. You try cloud sync folders. It takes 14 hours. You try "sneaker net" (shipping a hard drive via courier). It gets stuck in customs.
FileCatalyst has a built-in bandwidth detection tool. Run it first. It will tell you the actual available throughput between London and Sydney (not the theoretical speed your ISP promised). It then auto-negotiates the transfer speed. This is the "set it and forget it" feature that saves executive relationships. filecatalyst guide
FileCatalyst Guide