This depends on trip length, your travel style (backpacker or flashpacker) and what you are wanting to experience here in Australia.

According to the Australian Government, you need $5,000AUD in your bank account on arrival if you’re coming on a Working Holiday visa. This is a good savings target if you are wanting to either travel for a month or set yourself up for working and living in Australia after the Welcome To Travel week. 

However, everybody is different and to give yourself the best chance of experiencing as many things as possible in Australia, we would recommend just saving up as much as possible before you come travelling.