I got a reply from Acronis Support.
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Thank you for using Acronis True Image

Acronis True Image Home 2009 uses snapman.sys driver, the driver has snapman380 value.

Here are the directories::

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E967-E325-11CE-BFC1-08002BE10318} -> UpperFilters (the values are VolSnap tdrpman147 snapman380)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{71A27CDD-812A-11D0-BEC7-08002BE2092F} -> UpperFilters (the values are VolSnap tdrpman147 snapman380 timounter)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services


Thank you.
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Ianw