Why it is necessary
There are many reasons to do website maintenance. One of them is making sure that your site’s content is still up-to-date and relevant for your users, so you can maintain your user base and attract new ones. Another reason is making sure that Google can still crawl and index all of the pages on your site. If any content becomes deindexed, or if new pages are added without you manually submitting them through Google Search Console, then it may negatively impact SEO efforts and thus hurt traffic.
How to know if your website is perfectly maintained
Website maintenance is one of the most important aspects of managing a website. You will know your website is properly maintained if it remains virus-free and secure, if data is backed up regularly, if the content is current and accurate, if its performance meets user expectations, and if it’s kept up to date with the latest web standards. A website that isn’t well maintained will suffer from security issues such as malware, spam and phishing attacks. If you have outdated or broken links on your site it can have a negative impact on SEO efforts as well.