Why plugin updates break sites more often than they should
A plugin update can fail for reasons that have nothing to do with the plugin author doing anything wrong: a conflict with another plugin's assumptions, a PHP version the update didn't anticipate, or a customization someone made directly to plugin files that the update silently overwrites. None of these show up until the update is already live on production, which is why 'update broke my site' is one of the most common WordPress support requests that exists.
The gap isn't that updates are inherently risky -- it's that most sites update without a real safety net. If nothing was captured before the update ran, undoing a bad update means either finding an old backup that predates it by more than you'd like, or manually debugging a live, broken site under time pressure.
A safer sequence
Before updating, check the plugin's own changelog for anything explicitly flagged as a breaking change, and confirm your WordPress and PHP versions meet what the new version requires -- both are listed on the plugin's WordPress.org page or in its readme. Snapshot the plugin's directory specifically, not necessarily the whole site, since a scoped snapshot is faster to create and faster to restore from if something goes wrong.
Apply the update, then don't just check that the plugin still shows as active -- actually exercise the specific functionality that plugin provides. A page builder plugin updating cleanly doesn't tell you the pages it built still render correctly; a payment gateway plugin reporting success doesn't confirm a real transaction still completes. The verification has to match the plugin's actual job, not just its activation status.
What to do when an update does go wrong
If something breaks, the scoped snapshot from before the update should restore the plugin to its exact prior state in seconds, which buys you time to report the issue to the plugin author without leaving the site broken while you wait. Note the exact version you updated from and to, and what broke -- that detail is what turns a support ticket into a fast fix instead of a long back-and-forth.
WPFixAgent's update-plugins action does this snapshot-and-verify sequence automatically for every plugin it updates, restoring the previous version on its own if the post-update health check doesn't come back clean -- so the safety net exists by default rather than depending on remembering to build one yourself before every update.