silverstripe-framework/docs/en/installation/upgrading.md

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# Upgrading
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Usually an update or upgrade to your SilverStripe installation just means
overwriting files and updating your database-schema.
See our [upgrade notes and changelogs](/changelogs) for release-specific information.
## Process
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* Check if any modules (e.g. blog or forum) in your installation are incompatible and need to be upgraded as well
* Backup your database content
* Backup your webroot files
* Download the new release and uncompress it to a temporary folder
* Leave custom folders like *mysite* or *themes* in place.
* Identify system folders in your webroot (`cms`, `framework`, `sapphire` and any additional modules).
* Delete existing system folders (or move them outside of your webroot)
* Extract and replace system folders from your download (Deleting instead of "copying over" existing folders ensures that files removed from the new SilverStripe release are not persisting in your installation)
* Visit http://localhost/dev/build/?flush=1 to rebuild the website database
* Check if you need to adapt your code to changed PHP APIs
* Check if you have overwritten any core templates or styles which might need an update
* See [common-problems](common-problems) for a list of likely mistakes that could happen during an upgrade.
<div class="warning" markdown="1">
Never update a website on the live server without trying it on a development copy first.
</div>
## Decision Helpers
How easy will it be to update my project? It's a fair question, and sometimes a difficult one to answer.
* "Micro" releases (x.y.z) are explicitly backwards compatible, "minor" and "major" releases can deprecate features and change APIs (see our [/misc/release-process](release process) for details)
* If you've made custom branches of SilverStripe core, or any thirdparty module, it's going to be harder to upgrade.
* The more custom features you have, the harder it will be to upgrade. You will have to re-test all of those features, and adapt to API changes in core.
* Customisations of a well defined type - such as custom page types or custom blog widgets - are going to be easier to upgrade than customisations that modify deep system internals like rewriting SQL queries.
## Related
* [Release Announcements](http://groups.google.com/group/silverstripe-announce/)
* [Blog posts about releases on silverstripe.org](http://silverstripe.org/blog/tag/release)
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* [/misc/release-process](Release Process)