We Modeled 500TB Of CAD Engineering Files Across 6 Cloud Providers. The Cheapest Costs $3,495/Month. The Default Costs $11,500.
Engineering teams store CAD files (SolidWorks, AutoCAD, Inventor, Revit, Fusion 360, Catia, NX) differently than generic blob storage. The files are large (50MB to 2GB per assembly), version-heavy (one engineer saving an assembly produces dozens of revisions per week), and accessed simultaneously by many engineers during design reviews. A 500TB CAD library is normal for a 200-engineer firm.
The default cloud storage choice — AWS S3 Standard — costs $11,500/month at 500TB before egress. The same data on Wasabi costs $3,495/month with no egress fees. The same data on Backblaze B2 costs $3,000/month plus near-zero egress when paired with Cloudflare. Picking the wrong provider wastes $96,000-$120,000/year per 500TB tier.
For engineering firms with 1-5PB of CAD data across multiple project archives, the wasted spend reaches $500K-$1.5M/year — directly subtracted from engineering budgets that could fund seats, training, or hardware.
This post is the workload-specific cost decision framework for CAD engineering files at 500TB scale. It's modeled on real engineering firm storage profiles (mechanical, AEC, automotive, aerospace) we worked with in 2025-2026, and answers the question that broader "best cloud storage" lists do not: what is the most cost-effective storage architecture for unstructured CAD engineering files specifically?
What Makes CAD Storage Different From Generic Blob Storage
Before evaluating providers, the workload characteristics matter. CAD storage at 500TB is not the same as storing 500TB of website assets, video, or backup data.
Characteristic 1: File Size Is Large, Object Count Is Moderate
A typical 500TB CAD library contains roughly 5-15 million files, with an average size of 30-100MB. Compare this to:
- Web/SaaS workloads at the same volume: 100-500 million files averaging 5-10MB
- Backup/archive: 10-50K files averaging 10-50GB
This affects pricing because object storage providers charge per-1,000-operation. A 500TB library with 10 million files generates moderate operation counts, far below web-scale, which makes per-operation fees a smaller concern than per-GB storage.
Characteristic 2: Version History Multiplies Storage 3-10x
Engineers save assemblies every 10-30 minutes during active design. A single 500MB top-level assembly with 200 components can produce 20-50 revisions per week per engineer. Without aggressive version pruning, the actual on-disk size is 3-10x the unique-content size.
This makes lifecycle management critical. A naive "keep everything in hot storage forever" approach turns 500TB nominal into 1.5-5PB actual. Tiered storage (hot for current revisions, cold for old) typically reduces storage costs 60-80%.
Characteristic 3: Simultaneous Engineer Access Causes Egress Spikes
When 50 engineers join a design review and download a top-level assembly with all sub-components, you can move 2-10TB of egress in a single hour. AWS S3 + CloudFront would charge $90-$450 for that one design review. Wasabi or R2 with free egress charges $0.
For active engineering teams, egress patterns make egress fees a 30-50% line item on storage bills, often larger than storage itself.
Characteristic 4: Long-Tail Access Decay Is Steep
CAD files for a project follow a steep access decay curve: 80% of all reads happen in the first 6 months of a project; less than 5% in years 2+. But the data must be retained for 7-30 years (regulatory, IP, and design lineage requirements).
This means the cheapest architecture is tiered: hot/warm storage for active projects, deep archive for retained-but-rarely-accessed history.
The 6-Provider Cost Comparison At 500TB CAD
Here is what 500TB of unstructured CAD engineering files actually costs across major providers in May 2026. Egress is modeled at 30TB/month outbound (typical for an active 200-engineer firm). Operations modeled at 30M PUT + 100M GET per month.
| Provider | Storage ($/mo) | Egress ($/mo) | Operations ($/mo) | Total Monthly | Annual |
|---|---|---|---|---|---|
| AWS S3 Standard | $11,500 | $2,700 | $190 | $14,390 | $172,680 |
| AWS S3 Glacier Deep Archive | $495 | $9 | $5 | $509 | $6,108 |
| Cloudflare R2 | $7,500 | $0 | $135 | $7,635 | $91,620 |
| Backblaze B2 (direct egress) | $3,000 | $300 | $135 | $3,435 | $41,220 |
| Backblaze B2 (Cloudflare CDN) | $3,000 | $0* | $135 | $3,135 | $37,620 |
| Wasabi | $3,495 | $0 | $0 | $3,495 | $41,940 |
| Google Cloud Standard | $10,000 | $2,400 | $190 | $12,590 | $151,080 |
| Azure Blob Hot | $10,400 | $2,610 | $200 | $13,210 | $158,520 |
*Backblaze B2 + Cloudflare CDN free egress when traffic flows through Cloudflare via Bandwidth Alliance.
What This Table Reveals
- AWS S3 Standard ($14,390/mo) costs 4.6x what Wasabi costs ($3,495/mo) for identical CAD data with comparable durability.
- Glacier Deep Archive at $509/mo is the cheapest if you can tolerate 12-hour retrieval delays for everything. For active CAD work, this is unworkable for current projects but ideal for completed projects' archives.
- R2 vs Wasabi: R2 is 2.2x more expensive than Wasabi on storage but offers zero egress. The breakeven depends on your egress ratio. For most CAD firms with high egress (engineer downloads), R2 still loses to Wasabi/B2.
- Multi-cloud egress kills pricing: If your CAD app is hosted on AWS but storage is on Wasabi, every download out of Wasabi to your AWS app counts as egress. This is fine for Wasabi (zero egress fees) and fine for R2, but expensive for cross-cloud setups using S3-to-elsewhere.
The Cost-Optimal CAD Storage Architecture (For Most Engineering Firms)
After modeling 14 engineering firm deployments in 2025-2026, the cost-optimal architecture for 500TB CAD files at most firms is:
Tier 1: Active Projects (Hot, ~30% of total = 150TB)
Provider: Wasabi OR Backblaze B2 with Cloudflare CDN Cost: $1,050/month for 150TB
Engineers access these files daily. Files persist for 6-12 months in this tier before transitioning. No retrieval delays acceptable. Egress is high (engineer downloads, design reviews).
Tier 2: Recent Archives (Warm, ~30% of total = 150TB)
Provider: Wasabi OR Backblaze B2 Cost: $1,050/month for 150TB
Project completed in last 1-3 years but may need quick access for change orders, client requests, or design reuse. Lifecycle rule: transition from Tier 1 after 12 months of no modifications.
Tier 3: Long-Term Archive (Cold, ~40% of total = 200TB)
Provider: AWS S3 Glacier Deep Archive Cost: $200/month for 200TB
Completed projects retained for 7-30 years (regulatory, IP, design lineage). Accept 12-hour retrieval delay for once-or-twice-yearly access. Lifecycle rule: transition from Tier 2 after 24 months of no access.
Total architecture cost: $1,050 + $1,050 + $200 = $2,300/month for 500TB.
That's an 84% cost reduction vs S3 Standard at $14,390/month — without losing any CAD-specific functionality.
When To Pair Object Storage With A PDM System
Raw object storage is a building block. Most engineering firms add a PDM (Product Data Management) system on top to manage versions, check-in/check-out workflows, BOM relationships, change orders, and concurrent collaboration.
| PDM System | Best Cost-Optimal Backing Storage | Notes |
|---|---|---|
| Autodesk Vault | Wasabi or B2 (S3-compatible) | Vault supports custom S3 endpoints |
| SolidWorks PDM | On-prem or AWS S3 | Some restrictions on alternative backends |
| PTC Windchill | Wasabi or AWS S3 | Configurable backend |
| Siemens Teamcenter | Multi-cloud, configurable | Often S3 by default |
| Custom PDM (homegrown) | R2 or B2 or Wasabi | Full flexibility |
| GrabCAD Workbench | Provider-managed (no choice) | Pay GrabCAD pricing |
| Onshape | Provider-managed (no choice) | Pay Onshape pricing |
For most firms running self-managed PDM systems, swapping the storage backend from S3 to Wasabi or B2 saves $100K-$300K/year at 500TB scale without changing the PDM application layer.
Decision Framework: 5 Questions To Pick The Right CAD Storage
Question 1: How many active engineers and projects?
- Under 20 engineers, 5 active projects: Wasabi or B2 with simple bucket layout. Skip PDM if not already running.
- 20-100 engineers, 20-50 projects: Wasabi or B2 + lightweight PDM (Vault, custom). Tiered lifecycle rules required.
- 100-500 engineers, 100+ projects: Multi-tier architecture (hot/warm/cold). Self-managed PDM with object storage backend.
- 500+ engineers, enterprise: Enterprise PDM (Windchill, Teamcenter) with object storage backend across multiple regions for global team access.
Question 2: What is your egress ratio?
Egress ratio = (monthly outbound TB) / (stored TB). If this is high, egress fees dominate.
- Under 5%: Backblaze B2 at $6/TB storage + $10/TB egress works fine
- 5-25%: Wasabi (zero egress) or B2 + Cloudflare CDN (free egress)
- Over 25%: Wasabi or R2 (zero egress) — egress fees would kill metered providers
Question 3: What are your retention obligations?
- Pure design (no regulatory): Aggressive lifecycle to Glacier Deep Archive at 12-24 months
- Aerospace, medical, defense (FAR/DFARS, FDA, HIPAA): Verify Wasabi/B2 compliance; may need AWS GovCloud or Azure Government for regulatory tier
- Automotive (TS 16949, ASPICE): Most major providers acceptable; verify
- AEC/construction: 7-10 year minimum retention; cold archive tier mandatory
Question 4: What's your CAD application's storage interface?
- S3-compatible API: All providers work (R2, Wasabi, B2 are all S3-compatible)
- Native AWS only: Stuck with S3 (can still tier to Glacier Deep Archive aggressively)
- CIFS/SMB or NFS: Add a gateway like Storage Gateway or AWS DataSync to bridge object storage to file protocol
- HTTP/REST custom: Highest flexibility; pick on cost
Question 5: What is your disaster recovery requirement?
- RPO under 1 hour: Cross-region replication required; raises cost ~30%
- RPO 1-24 hours: Daily snapshot to a different provider works (e.g., Wasabi primary + B2 backup)
- RPO 7+ days: Weekly archival sync sufficient
- No DR (single source): Risky for engineering data; not recommended above 50TB
Real-World Cost Modeling: Three Engineering Firm Profiles
Profile A: Mid-Size Mechanical Engineering Firm (50 Engineers, 500TB)
- 50 engineers, 30 active projects
- 500TB total, 100TB hot/200TB warm/200TB cold
- Egress: 25TB/month
- Uses Autodesk Vault as PDM
Naive S3 Standard architecture: 500TB x $23 + 25TB x $90 = $13,750/month
Optimized architecture:
- 100TB Wasabi (hot): $700
- 200TB B2 (warm) with Cloudflare CDN: $1,200
- 200TB Glacier Deep Archive (cold): $200
- Total: $2,100/month — 85% savings vs S3
Annual savings: $139,800.
Profile B: Large AEC Firm (250 Engineers, 2PB)
- 250 architects/engineers, 80 active projects
- 2PB total: 400TB hot/700TB warm/900TB cold
- Egress: 80TB/month
- Uses custom PDM with S3-compatible API
Naive S3 Standard: 2,000TB x $23 + 80TB x $90 = $53,200/month
Optimized:
- 400TB Wasabi: $2,800
- 700TB B2 + Cloudflare: $4,200
- 900TB Glacier Deep Archive: $900
- Total: $7,900/month — 85% savings vs S3
Annual savings: $543,600.
Profile C: Aerospace Compliance-Heavy (100 Engineers, 1PB, GovCloud Required)
- 100 engineers, 12 active programs
- 1PB total under DFARS/CMMC compliance
- Must remain in AWS GovCloud (regulatory)
- 30TB/month egress
Forced architecture (compliance):
- All in AWS GovCloud S3 Standard: 1,000TB x $23 = $23,000
- Lifecycle to S3 IA: 700TB x $12.50 = $8,750
- Lifecycle to Glacier Deep Archive (GovCloud): 600TB x $1 = $600
- Egress: 30TB x $90 = $2,700
- Total: ~$15,000-$20,000/month depending on tier ratios
Annual: $180K-$240K. Less optimization possible due to compliance lock-in to AWS GovCloud. For regulated workloads, the cost premium is the price of compliance.
Migration Playbook: Moving 500TB Off S3 To Wasabi/B2
For engineering firms wanting to migrate, here is the playbook from 4 successful migrations we ran.
Phase 1: Audit Current State (Week 1)
- Inventory all S3 buckets containing CAD files
- Calculate per-bucket storage, egress, and access patterns from CloudTrail
- Identify which files are actively accessed vs cold
- Map PDM/CAD application S3 endpoints (you'll need to repoint them)
Phase 2: Provision New Storage (Week 2)
- Create Wasabi or B2 buckets matching your existing S3 hierarchy
- Configure access keys and IAM equivalent (Wasabi/B2 use S3 access keys)
- Test S3 API compatibility against your PDM/CAD app endpoints
- Run a small test migration (1TB) to validate
Phase 3: Bulk Sync (Weeks 3-6)
- Use rclone, AWS DataSync, or Wasabi/B2 native tools for the bulk copy
- Throttle to avoid impacting current production reads from S3
- Validate checksums after copy (CAD files are sensitive to corruption)
- Plan for ~5-15TB/day throughput typical for cross-cloud migrations
Phase 4: Cutover (Week 7)
- Schedule maintenance window with engineering teams
- Final delta sync of any files modified during migration
- Repoint PDM/CAD application S3 endpoints to new provider
- Validate engineers can check-out, modify, save, check-in normally
- Keep old S3 read-only for 30 days as fallback
Phase 5: Decommission (Week 8+)
- After 30 days of stable operation, delete S3 source data
- Lock in lifecycle rules on new storage (hot → warm → cold)
- Document new architecture for future engineers
- Schedule quarterly cost reviews
Total migration time: 6-10 weeks for 500TB. Engineering team disruption: less than 1 day for the cutover window.
When NOT To Migrate Off S3 For CAD
To be clear, sometimes S3 is the right answer:
- You're using S3-tightly-integrated AWS services: Kendra search across CAD metadata, AWS Lake Formation analytics on BOM data, Lambda triggers on file uploads. Migration breaks these.
- You have AWS Enterprise Discount Program (EDP) credits to burn: Sometimes the cost difference is offset by EDP commits already purchased.
- Compliance requires AWS GovCloud or specific AWS regions: No alternative providers offer equivalent compliance certifications.
- Your engineering team has zero capacity for migration: Not worth the disruption if the savings don't fund another engineer or seat.
For 50-70% of engineering firms we audit, migration to Wasabi/B2 + tiered architecture is the right answer. For the remaining 30-50%, optimizing within S3 (lifecycle to IA, then Glacier) captures most of the savings without provider migration.
A 30-Day CAD Storage Cost Audit
If your engineering firm spends over $20,000/month on CAD storage, run this audit.
Week 1: Inventory
- Total storage across all CAD-related buckets/storage accounts
- Egress patterns by month for last 90 days
- Access pattern analysis: what % of files accessed in last 30/90/365 days
- Operation counts (PUT, GET, DELETE per month)
- Existing tier distribution (Standard, IA, Glacier, etc.)
Week 2: Cost Model Alternatives
For each cost-driving bucket:
- Calculate Wasabi cost
- Calculate B2 + Cloudflare cost
- Calculate optimized AWS-only architecture (Standard + IA + Glacier)
- Identify migration effort and timeline
Week 3: Lifecycle Policy Audit
For all CAD storage:
- Are files older than 12 months in hot storage? (They probably shouldn't be.)
- Is there any automated tiering? (If using S3 Intelligent-Tiering on small files, you may be losing money to monitoring fees.)
- Are deleted files actually deleted, or version-locked taking up space?
Week 4: Decide and Plan
- Pick provider strategy (stay on S3 with optimization, or migrate to Wasabi/B2)
- Build migration schedule if applicable
- Implement lifecycle rules immediately (savings even if you don't migrate)
- Lock in monthly cost review cadence
After this audit, expect 50-85% cost reduction on CAD storage within 90 days.
The Bottom Line
For most engineering firms with 500TB of CAD files, the cost-optimal storage architecture in 2026 is tiered: Wasabi or B2 for hot/warm tiers, S3 Glacier Deep Archive for long-term retention. This architecture costs $2,100-$3,500/month vs S3 Standard's $11,500-$14,000/month. The annual savings ($100K-$140K per 500TB tier) directly fund engineering seats, training, or hardware.
The discipline most engineering teams skip: treating CAD storage as a workload-specific decision rather than a default S3 deployment. CAD files have unique access patterns (large files, version churn, simultaneous engineer access, steep long-tail decay) that make generic "use S3" advice expensive.
If your engineering firm spends over $50,000/month on CAD storage and hasn't audited the architecture in the last 18 months, you are very likely overpaying by 60-85%. Our cloud cost optimization team runs free CAD storage audits and typically identifies $100K-$500K/year in savings within 60 days. Run a free Cloud Waste Scorecard to find your biggest engineering data cost leaks first.
Further reading:
- 500TB Storage TCO Comparison: 7 Providers Modeled
- Best Cloud Storage by Workload Decision Framework 2026
- Cloudflare R2 vs AWS S3 Decision Framework 2026
- S3 Intelligent-Tiering vs Standard Hidden Costs
- Wasabi Cloud Storage Pricing 2026
- Backblaze B2 Pricing 2026
- AWS S3 Glacier Pricing and When to Archive
- Cloud Cost Optimization FinOps Service
- Wasabi Pricing
- Backblaze B2 Pricing
