If a site was negatively impacted from the Google August 26 Spam update what should they start doing immediately?

Google confirmed the August 26 spam update. Kaspar Szymanski, Senior Director at SearchBrothers.com, is a former senior member of Google's Search team with hands-on webspam enforcement experience, and he now leads penalty recovery for businesses. His first immediate step for impacted sites is to save and preserve server logs. Logs show how bots interact with the site, and on large sites with high landing page volume they become a critical diagnostic asset, though they do not replace the instant analysis the update demands. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.