What causes a website's snapshot to roll back?

　　A website snapshot rolling back signals that some aspect of the site goes against the search engine's algorithm — in other words, there are problems with the site's optimization, and that is what makes the snapshot rollback happen. Industry veterans have their own set of ways to deal with a snapshot rollback, but for beginners it's a scramble. So what exactly causes a website's snapshot to roll back?【website optimization】

　　1. An unstable server:

　　The stability of the hosting space is especially important for website optimization, and it is also the cause most prone to problems. When the space is unstable and the site sometimes won't open, spiders can't crawl it normally, so the snapshot reverts to one from an earlier period when the space was stable. I suspect this is the reason for my own site — I'm using one of those virtual hosts that cost a few dozen yuan, and Jiankongbao shows the site speed becoming very unstable every afternoon!

　　2. Friend links getting penalized:

　　Friend links play a big role in website optimization, but if the sites you've exchanged links with get their authority reduced or get de-indexed, that has a knock-on effect on your site too, hurting how friendly the search engine considers your site to be. So if you discover a problem with a friend link, delete the other party's link promptly — whether they remove ours doesn't matter much.

　　3. Constantly changing the homepage title:

　　Changing the title and keywords of a site's homepage is a mistake many SEO beginners make. They make major adjustments to the homepage, having failed to properly plan the site title before launch and then revising it afterwards. Revising the title within a few days of launch isn't a big deal, but if the site has been live for a while, changing the title again can easily cause the page snapshot to roll back; and if you change it often, the site can easily end up being de-indexed.

　　4. Content not updated for a long time

　　Website content is the core of the site. Every time a spider visits and finds that your site hasn't added new content for a long time, it can only leave disappointed; over time the spider will find the site endlessly dull and very likely won't come back, so the site's snapshot will stall at the time of the spider's last visit. That's why content building must be on a fixed schedule, at fixed times, in fixed amounts, giving the spider a pattern and letting it form a habit.

　　5. Poor content quality and a high degree of duplication

　　Nowadays many webmasters, short on time, choose to use scraping to fill out their site's content. As everyone knows, search engines like high-quality original material, but if most of a site's information is scraped, it also hurts how friendly the search engine considers the site to be and may lead to a reduction in authority.

　　That's the whole of "What causes a website's snapshot to roll back?" — shared only for webmaster friends to exchange and learn from. SEO optimization is a process that requires persistence, and I hope we can all improve together.