As long as AO3 remains blocked in some countries, fans will continue to run mirror sites. However, the landscape is always changing:
your favorite fanfictions as EPUB or PDF files when the site is online so you can always read them offline during unexpected outages. ao3 mirror link
But even the best servers have bad days. As long as AO3 remains blocked in some
The Ultimate Guide to AO3 Mirror Links: How to Access Archive of Our Own Anywhere ao3 mirror link
If you Google "AO3 mirror link" and find a site asking for login credentials that isn't archiveofourown.org or ao3.org , do not enter your password . Unofficial mirrors that ask for logins are phishing attempts.