Email Archive Sizing Calculator
Estimate your storage requirements with deduplication and compression savings
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Results
Raw Monthly Volume
286 GB
After Deduplication
172 GB
Saved 40.0%
After Compression
137 GB
Extra saved 20.0%
Yearly Storage Need
1,648 GB
Total reduction: 52.0%
Storage Reduction
Guidance on Deduplication & Compression
Deduplication:
- Message-ID dedup typically saves 5–15%
- Attachment dedup (logos, forms, policies) can save 25–60%
- Combined: often 30–55% reduction before compression
Compression:
- Text/HTML compress well, docs moderate, images/PDFs less
- Typically adds another 15–30% savings on the remaining data
Overall effect: Expect total reduction of 50–70% compared to raw volume.
Real World Usage Data
Site #1
- 📧 8-9 million emails
- 📊 25 GB index db
- 🗄️ 23 GB mysql db
- 💾 200 GB stored emails
Site #2
- 📧 2.5 million emails
- 📊 9 GB index db
- 🗄️ 10 GB mysql db
- 💾 700 GB stored emails
72% Savings
Site #3
- 📧 25 million emails (11M duplicates)
- 📊 26 GB index db
- 🗄️ 26 GB mysql db
- 📦 3.7 TB raw volume
- 💾 1 TB stored volume
- ✓ 72% dedup+compression gains
58% Savings
Site #4
- 📧 44 million emails (2.3M duplicates)
- 📊 43 GB index db
- 🗄️ 80 GB mysql db
- 📦 9 TB raw volume
- 💾 3.7 TB stored volume
- ✓ 58% dedup+compression gains