<p>Craft 3 multi-site is an extension of <a href="https://craftcms.com/docs/localization-guide" rel="nofollow noreferrer">locales</a> in Craft 2, so how the data is stored is virtually identical.</p>

<p>The difference is that locales in Craft 2 are tied to language/country codes, but sites in Craft 3 are more abstract concepts that are user defined.</p>

<blockquote>
  <p>If I have 'Site A' and 'Site B' running off the one install and someone creates an account on Site A, will they also have an account on Site B?</p>
</blockquote>

<p>User accounts are global.  They are not created on a per-site basis, but they can be restricted on a per-site basis through user/user group permissions.</p>

<blockquote>
  <p>Will we be able to restrict which CP users see data from which site?</p>
</blockquote>

<p>User/user group have site permissions for elements that support it just like they have "locale" permissions in Craft 2.</p>

CC BY-SA 3.0
2017-10-05T21:12:40.650Z
Thank you for the answer. When you say "User/user group have site permissions for elements that support it" - do those elements include user data? I am thinking about CP users having access to some user data but not others on a per site basis.
Adam George
CC BY-SA 3.0
2017-10-05T22:03:09.313Z
Updated answer.  I'd also recommend just installing it to see the feature set directly. :) https://github.com/craftcms/docs/blob/master/en/installation.md
Brad Bell
CC BY-SA 3.0
2017-10-05T14:11:32.047Z
2017-10-05T22:02:10.413Z
2017-10-05T22:02:10.413Z
Brad Bell
<p>How will data be handled in Craft 3, when it comes to the '<a href="https://craftcms.com/news/craft-3-multi-site" rel="nofollow noreferrer" title="multi-site">multi-site</a>' feature?</p>

<p>Will most structured data will be accessible across sites?</p>

<p>What about <strong>user data</strong>?</p>

<p>If I have 'Site A' and 'Site B' running off the one install and someone creates an account on Site A, will they also have an account on Site B?</p>

<p>Will we be able to restrict which CP users see data from which site?</p>

<control-panel><user-profile><multi-site>
User data segregation for multi-sites in Craft 3?
# User data segregation for multi-sites in Craft 3?

(Asked by: username_0 on 2017-10-05)

How will data be handled in Craft 3, when it comes to the '[multi-site](https://craftcms.com/news/craft-3-multi-site "multi-site")' feature?

Will most structured data will be accessible across sites?

What about **user data**?

If I have 'Site A' and 'Site B' running off the one install and someone creates an account on Site A, will they also have an account on Site B?

Will we be able to restrict which CP users see data from which site?

**Tags:** control-panel, user-profile, multi-site


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## 1 answers

### Answer by username_1 on 2017-10-05. Score: 1 | Accepted answer

Craft 3 multi-site is an extension of [locales](https://craftcms.com/docs/localization-guide) in Craft 2, so how the data is stored is virtually identical.

The difference is that locales in Craft 2 are tied to language/country codes, but sites in Craft 3 are more abstract concepts that are user defined.

> If I have 'Site A' and 'Site B' running off the one install and someone creates an account on Site A, will they also have an account on Site B?

User accounts are global. They are not created on a per-site basis, but they can be restricted on a per-site basis through user/user group permissions.

> Will we be able to restrict which CP users see data from which site?

User/user group have site permissions for elements that support it just like they have "locale" permissions in Craft 2.

> **Comments:**
> **username_0**: Thank you for the answer. When you say "User/user group have site permissions for elements that support it" - do those elements include user data? I am thinking about CP users having access to some user data but not others on a per site basis.  
> **username_1**: Updated answer.  I'd also recommend just installing it to see the feature set directly. :) https://github.com/craftcms/docs/blob/master/en/installation.md  

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