client upgraded wordpress and now site is down

WordPress was updated for website.  Now site is down.  Was told by host that I need to reupload:

wp includes directory
wp-settings.php file

If I don't have a backup of the site what do I do?  I thought host had backup of site but they do not.
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What's the Golden Rule when doing updates?

Do you still have access to the dashboard?
Jason C. LevineDon't talk to me.Commented:
1) Can you get to the site at all?  Admin backend?  If so, re-install WordPress from Dashboard | Updates.

2) If not, you need to download WordPress from  Extract what they say above and upload it.  If that restores access to the backend, do what I describe in step 1.

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Jason C. LevineDon't talk to me.Commented:
What's the Golden Rule when doing updates?

Don't let the client do the update?
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nsitedesignsAuthor Commented:
I didn't do the update.  My client did after being prompted from an auto email from host that a newer version of wp was available.  Unfortunatley, the host did not recommend doing any backups prior to making update!  Let me see what I can figure out.
nsitedesignsAuthor Commented:
Host was able to help me do a rollback of site.  This tech support was MUCh better than the first one.  Site is now fully functioning.  I will also keep a local backup on my computer.
Jason C. LevineDon't talk to me.Commented:
I will also keep a local backup on my computer.

Thanks for the points.  I wouldn't do that unless you plan to take backups's better to pay for (or get the clients to pay for) a robust backup solution that not only backs up files but also the database (the heart of the site).  

What I typically do is offer clients one of the following:

- Install Backup Buddy or similar plugin and connect it to a Dropbox or S3 account, configure it for weekly backups.
- Walk client through installation and configuration of VaultPress for live backup and disaster recovery
- Add client to my ManageWP account (for a fee) and I handle all updates and backups for them.

The last option is a great way to get steady income from consulting gigs after the primary work is done.
nsitedesignsAuthor Commented:
Thanks - will share with client.  They are a non-profit that relies on donations so funding is very limited.
Jason C. LevineDon't talk to me.Commented:
Backup Buddy has a free version.
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