Build and Capture image in SCCM 2012

SCCM 2012 Task sequence has among other options the option called Build and Capture image.
Well, if I understand this option is applied to an existing computer that has applications installed on it, and the purpose of Build and capture  is to make a copy of the computer and get that copy saved as Wim file in the network.
After the operation of Build and Capture is completed successfully, we can import the Wim FIle created by Build and Capture. We'll Add operating System image to import the Wim file. Then we 'll create another task sequence, but this time we'll select "Install and existing image package".
Now this image, when deployed to a new computer or an existing computer, will the image overwrite the exiting computer OS and applications ? if so what does it do with existing user profiles ?

I also want to confirm , that my statement above is  correct
Any help will be very much appreciated.

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David Johnson, CD, MVPOwnerCommented:
A capture sequence will sysprep and capture an existing installation.
Build and Capture does that it builds a new computer and then captures the new computer.
jskfanAuthor Commented:
<<<Build and Capture does that it builds a new computer and then captures the new computer>>>

Not clear....

Can you give an example, please ?

jskfanAuthor Commented:
For instance, if you have a computer with all needed application installed on it, that s usually what s called Reference Image.

You create task sequence so that you can Build and Capture an image from the Reference Image, this will create a WIM file for the reference image in a network share wherever specified in SCCM.

The next task sequence , is Install existing image package. this will be deployed to computers that are either:

New computers, that are not used by users
Computers that are used by user, but they need  all the Applications installed in the Reference Image.
Though this second scenario , I am not sure if it is common in real world. Because it is better to deploy an Application to an exiting user than the whole computer image unless if it is an OS upgrade..

Any Expert to shade some light on this ?

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David Johnson, CD, MVPOwnerCommented:
forget about build and capture for now.. wipe it from your memory.. done now?

You have a reference computer (hopefully you used a virtual machine since physical machines introduce machine dependencies).  You should now create a capture sequence to capture this machine to what is commonly called a thick image.

I normally only use build sequences this way if a piece of software gets updated all I have to do is change the application source files.  i.e. adobe reader.. I just have to get the new executable and rename it to adobereader.exe and put it in my application's source directory overwriting the previous version. This makes maintenance a lot easier.

About the only thick image I use is for Autocad since it takes forever to install.

you then apply this image in your build sequence (without the capture)

Back to build and capture.. the name implies build a reference machine and then capture it. it will overwrite any existing data on the reference machine.
David Johnson, CD, MVPOwnerCommented:
it is better to install the common applications as part of the build process i.e. all laptops get the cisco anyconnect vpn software, desktop's do not. but all machines get adobe reader and office. for office I constantly add updates to the updates folder in the office media source location. Be careful about windows updates in your task sequence.. things get confused if there are over 100 updates.

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jskfanAuthor Commented:
I know the word "BUILD" is confusing...

Capture has more sense.. it is like taking a snapshot of existing computer (Reference Image) and deploy it to other computers...
when deployed it overwrites whatever existed in the destination computers, but end users will have their profiles the same as they were before Deployment....
jskfanAuthor Commented:
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