Free Tier - Data Warning?

Question

I am using just one EC2 free tier linux instance.
I check the data stored on the linux instance with df -h command, and it reports 4.2GB used of 30g available. 
However, I received a Data warning email saying 27GB was used, nearing the 30GB limit.
*edit - and I can confirm I only have one volume too, of 30GB

I am sure there is only one instance running, so something seems quite odd to me.
Advice appreciated. Thanks.

Shlomo Dubrowin · Answer

EBS volumes have a free tier of 30GB per month for the first 12 months of your account. The volumes are charged by allocated space and not used space. So if your instance has 30GB of EBS storage allocated, then you are using 30GB of EBS even if only 4.2GB of the 30 is used. The 30GB is per month, so the fact that you received a warning of 27GB toward the end of the month, indicates that you will use the full amount (either the full amount, just under or just over) in the coming days. Given that you stated you have 30GB allocated, this makes sense that you will use the full amount.

Free Tier - Data Warning?

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