I saw some information on the Australian National Library website and checked further, below is the correspondence on the matter. Bold items are mine for emphasis.
I'm concerned about the legal deposit requirements as they related to independent authors who publish e-books and via print-on-demand services. Especially if the services they use are based outside of Australia. In checking the website FAQs on this I thought I was required to comply, yet when I went to the New Account page for the Legal Deposit I saw I have to identify as either a Publisher or Government, while I'm an author. This makes me wonder if I need to make a legal deposit or not. I don't actually print anything, just make a print ready PDF available for printers to use, and I also make a e-pub copy available via overseas distributor websites.
Can you please provide me with the correct requirements for my situation.
their reply is:
Thanks for your recent query about Legal Deposit.
Legal Deposit applies to all Australian self-publishing authors - you are considered to be the publisher, so in setting up your edeposit account, you should select 'Publisher.'
You may also find the following blog post helpful: https://www.nla.gov.au/blogs/behind-the-scenes/2016/05/17/self-publishers-we-want-you
Please don't hesitate to contact me if you have any further queries.
In some states the same applies to you lodging copies with the state libraries as well.