What happens to roaming profile data when the profile size has been reached on 2012 R2?

When using profile limits on roaming profiles for Server 2012R2 RDS, what happens to the users profile data when the limit is exceeded?  I know they get the prompt that they have exceeded the limit but trying to determine what happens on the back end.  Will their profile data continue to be copied to the repository even though the data exceeds the limit or does it only copy the data up to the limit?  Is profile corruption a possibility?
Thank you
Ryan YanezAsked:
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David Johnson, CD, MVPOwnerCommented:
only the maximum amount will be saved on the server, profile corruption could occur, use folder redirection to carve out the larger files and also reduce your logon/logoff times so you don't have to transfer so much at logon/logoff

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Ryan YanezAuthor Commented:
Thanks David that's what I was afraid of.  My concern is around Outlook 2013 being able to allow caching.  We are seeing the OST at around 800MB when set to 6 months.  With a profile limit of 1GB it doesn't give us much room.  I think I will have to use folder redirection for the OST for sure among others.  But that wont be till Q1 due project work.  

So do you happen to know if there is a priority to what data is copied first (i.e. user.dat) or does it just start to copy indiscriminately?  

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Windows Server 2012

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