The point I was making is that your requirements don't add up - how do you know that you need 30 days of cold data, if you don't know how much data you have in hot/warm? If you're indexing 10 MB/day, the hot+warm storage would last for almost 10 years - then what's the point of another 30 days of cold (300 MB)?
If you index 150GB/day, the hot+warm lasts 2 days, and the cold storage would be almost 5 TB. These two extremes will change the storage needs quite a lot.
Normally, you'll have a retention time requirement for data that is online ( hot+warm+cold ) and offline ( frozen ).
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