Open Source for ILM (Data Archiving)

Hi,

Anybody out there currently using OpenSource products for their ILM strategy? I have the usual OS concerns.

I'm looking for a Data Archiving (not backup) solution (must work with Windows servers). Given the current economic climate, my budget is not going to stretch to a "COTS"
solution for ILM.

Any advice, pointers, suggestions is greatly appreciated.

Many thanks & regards