Updating Exchange 2013 CU1 to CU11 Steps

So I am looking online to see what needs to be done to upgraded Exchange 2013 on a Server 2012 STD server from CU1 (Build  15.0.620.29) to the latest version.

We are having issues with temp folder for TransportRoles\Data\Temp being filled up with a bunch of temp files and we saw on technet that we require to upgrade to CU8 or newer to resolve this issue.

Does anyone have any clear steps that I need to follow or it just download the update, run it and reboot or do I need to do things like a schema update.
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AmitIT ArchitectCommented:
Is this stand-alone or you have DAG?
It will probably check to see if you have met the preflight check before it installs.
The rollups on the Exchange boxes are finicky.

If it appears in the update folder on the server then,run it that way.

Otherwise you will probably need to run it as a standalone from an elevated command prompt with ACU turned off.
MasterNe0Author Commented:
Standalone server.

I am trying to find out all the downside of doing this as we need to communicate this with our client before having do such a huge update that might break their server if it goes all wrong.
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AmitIT ArchitectCommented:
Yes, that is totally right, you need to be ready for worst situation or we say back out plan in change management. This is what you need to do:

1) Take Server backup. Both AD and Exchange.
2) Upgrading schema, your AD admin will know it. Else, if your ID is part of Enterprise, schema and Domain admin, setup will do it automatically.
3) If you have any OWA customization or any 3rd party tool, note down all settings, as that might be overwritten by new update.
4) Now you can start the CU installation. However, run the setup in admin mode.

For more info, check this:

Now, in case you have any issue and you need recover it back. Follow this:
MasterNe0Author Commented:
We are the admins for the server. I never done a exchange update that requires a AD update schema. Will the update itself just do it or will it STOP and tell us what needs to be done or are theri steps for schema updates.
What's your backup software?
I usually take an image of my server and run a virtualized instance and apply patches to see what breaks.
Beats the beejeeez of of trying to restore a production server if M$ does it's usual high qualty patching job.
MasterNe0Author Commented:
backup exec but dont have a way to really virtual the box.
AmitIT ArchitectCommented:
If you have required rights, setup will do it automatically, else you will get the error and you can perform it from command line also. However that also need same rights.

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MasterNe0Author Commented:
Do you know how long it will take to run the update?
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