Svr2012R2 shadow copy date / capacity limite issue

Question is why is shadow copy / recovery limited to ~40days.
The C-drive has 300+GB of space of a 500GB drive.
Limit was changed to Unlimited shortly after installation yet the recovery span is ~44 days.
This is the case on Two servers.
Each the same hardware, installed a month apart, both set to unlimited both holding data referenced for the 44 day period.
How to allow it to run to a greater time / quantity of copies?
The D-drive is 4TB w/~3TB free.
If I redirect the C-drive shadow copy to the D-drive will the VSS data now available on the c-drive be lost?
chasster123Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The amount of space is not the sole limitation to the number of copies.  By default, the limit is 64 copies.  You can edit the registry and increase this, I believe to 512 copies, but no more.

The MaxShadowCopies registry value specifies the maximum number of client-accessible shadow copies that can be stored on each volume of the computer. A client-accessible shadow copy is a shadow copy that is created using the VSS_CTX_CLIENT_ACCESSIBLE value of the _VSS_SNAPSHOT_CONTEXT enumeration. Client-accessible shadow copies are used by Shadow Copies for Shared Folders. For more information about shadow copies, see the VSS documentation.

If the MaxShadowCopies registry value does not exist, the backup application can create it under the following registry key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VSS\Settings

Create a value with the name MaxShadowCopies and type DWORD. The default data for this value is 64. The minimum is 1. The maximum is 512.

Note  For other types of shadow copies, there is no registry value that corresponds to MaxShadowCopies. The maximum number of shadow copies is 512 per volume.


Note  The MaxShadowCopies setting is supported on Windows Server 2003 or later.

See MaxShadowCopies in https://msdn.microsoft.com/en-us/library/bb891959(v=vs.85).aspx
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chasster123Author Commented:
Have adjusted the first of two servers to a decimal 256 as this should reach the general time frame that I'm looking for.

Cheers,
cs
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