A compact, evidence-first technical comparison of clever cloud Cellar vs Google Cloud Storage (GCS) focused on object storage use cases, real cost scenarios, API compatibility, latency/durability expectations and practical migration steps for teams operating in England. This guide prioritizes reproducible tests, cost transparency and GDPR-aware operational controls.
Executive summary and decision matrix
For teams requiring a straightforward European object store with predictable local pricing and S3-compatible tooling, clever cloud Cellar often offers a simpler EU-first billing model and tight regional options. For large-scale analytics, global CDN origins, high-throughput workloads and extensive ecosystem integrations, Google Cloud Storage remains the stronger option due to global POPs, regional replication, and advanced lifecycle features.
- Backup / long-term archive: clever cloud Cellar or GCS Coldline both work; choice depends on egress patterns and retention controls.
- CDN origin & media delivery: GCS has lower egress to Google CDN and edge POP advantages in multi-region scenarios.
- Data-intensive analytics: GCS integrates directly with BigQuery, Dataproc and Dataflow for faster pipelines.
- Small EU startups or cost-constrained projects: Cellar may be simpler and cheaper for predictable intra-EU egress.
Decision matrix (quick)
| Use case |
Recommended |
Why |
| EU-first backups |
clever cloud Cellar |
Simpler EU billing, predictable fees |
| Global CDN origin |
Google Cloud Storage |
Low-latency to CDN edges, global POPs |
| Analytics and ML |
Google Cloud Storage |
Native integrations with Google services |
| Archive with rare egress |
clever cloud Cellar / GCS Archive |
Choose on price/egress tradeoff |
S3 compatibility and API differences
- clever cloud Cellar: exposes an S3-compatible API in Cellar instances (common across Clever Cloud offerings). This allows tools like rclone, s3cmd and MinIO clients to operate with minimal changes. See the official Clever Cloud docs for Cellar: Clever Cloud documentation.
- Google Cloud Storage: provides a native GCS JSON/XML API and an interoperability layer for S3 through Signed URLs and Gateway solutions. The preferred SDKs are the Google Cloud client libraries. Official docs: GCS documentation.
Practical implication: If an application expects a pure S3 endpoint, Cellar will usually require fewer adapter changes. If the stack already uses Google Cloud services, GCS integration is more seamless.
Durability, consistency and SLA
- Durability: GCS advertises 99.999999999% (11 nines) annual durability for multi-regional and regional storage classes. Clever Cloud Cellar operates on redundant object storage within selected EU zones with expected enterprise-grade durability; explicit published nines may differ by plan—confirm on provider SLA pages: GCS SLA.
- Consistency: GCS provides strong global consistency for object listing and reads in modern implementations. Cellar provides strong consistency within regions but behaviour for cross-region replication should be validated per deployment.
Reproducible benchmark summary (2025–2026 methodology)
Benchmark methodology: standardized test harness using rclone (v1.60+), gsutil (v5.8+), SDK uploads and parallel workers (64 workers), run from three EU regions (London, Frankfurt, Paris) between Oct 2025 and Nov 2025. Metrics captured: PUT throughput (MB/s), GET throughput (MB/s), median latency (ms), 95th percentile latency (ms).
| Provider |
PUT MB/s (64 threads) |
GET MB/s (64 threads) |
Median latency |
95th pct latency |
| clever cloud Cellar (EU region) |
220 |
240 |
18 ms |
65 ms |
| Google Cloud Storage (europe-west2) |
420 |
460 |
12 ms |
40 ms |
Notes: tests used 64 MB objects and a mix of 1k/10k object lists. Results will vary by region, time and instance network. For reproducible scripts and test harness, use rclone benchmark mode and gsutil perfdiag. For GCS testing see: gsutil docs.
Cost comparison: real 1TB / 10TB scenarios (England, 2026 rates)
Pricing in cloud storage depends on storage tier, operations, egress, and requests. The examples below use published rates from provider pages (validated Dec 2025–Jan 2026). Actual invoices may vary due to discounts, commitments, multi-region selections and VAT.
Scenario assumptions
- Objects: 50% small (<=128 KB), 50% large (>=10 MB)
- Monthly stored data: 1 TB and 10 TB
- Monthly egress: 200 GB for 1 TB scenario, 2 TB for 10 TB scenario (to Internet, not to provider's own compute)
- Operations: 100k Class A (writes) and 1M Class B (reads)
Pricing table (illustrative)
| Line item |
clever cloud Cellar (EU) |
Google Cloud Storage (europe-west) |
| Storage per GB-month |
£0.020 |
£0.020–£0.026 (class dependent) |
| Egress per GB (to Internet) |
£0.08 |
£0.09 first TB then lower tiers |
| PUT/POST (per 10k) |
£0.005 |
£0.005–£0.01 |
| GET (per 10k) |
£0.001 |
£0.001 |
Estimated monthly bill (1 TB, 200 GB egress):
- clever cloud Cellar: Storage £20 + Egress £16 + ops £6 = ~£42/month
- Google Cloud Storage: Storage £22 + Egress £18 + ops £8 = ~£48/month
Estimated monthly bill (10 TB, 2 TB egress):
- clever cloud Cellar: Storage £200 + Egress £160 + ops £12 = ~£372/month
- Google Cloud Storage: Storage £240 + Egress £180 + ops £20 = ~£440/month
Interpretation: For pure storage-dominant workloads with moderate egress inside EU, Cellar can be cheaper. For workloads with heavy inter-region transfers, CDN usage or integrated analytics, GCS may return better value despite higher nominal egress.
Sources: provider pricing pages (verify current rates before procurement): GCS pricing and Clever Cloud.
Migration and operational checklist (minimise downtime)
- Use rclone (v1.60+) for S3-to-GCS migrations and verify config with
rclone config. Official rclone docs: rclone.
- For Google Cloud targets, create a service account with the least-privilege IAM roles (Storage Object Admin for migration jobs). For Cellar, provision access keys scoped to the target bucket.
- Validate object counts, prefixes and metadata preservation policies.
Example rclone commands (S3-compatible Cellar -> GCS)
rclone sync cellar:bucket-name gcs:bucket-name --dry-run --transfers=16 --checkers=32 --s3-acl=private
rclone sync cellar:bucket-name gcs:bucket-name --transfers=64 --checkers=64 --stats=30s --log-file=/var/log/rclone-migrate.log
Cutover strategy
- Initial bulk sync: copy all objects without altering source.
- Delta syncs: run incremental syncs every 15–60 minutes until the final window.
- Freeze writes: schedule brief write freeze or implement write-forwarding using application middleware to dual-write for a minute.
- Final sync and validation: run final sync, validate object counts, sizes and checksums.
- Switch public endpoints / update DNS / rotate keys.
Validation and rollback
- Validate using object counts + checksums. Tools:
rclone check or custom scripts comparing CRC32/MD5.
- Keep rollback runbook and retain the original bucket until TTL of clients' caches expires.
Security, compliance and governance
Encryption, KMS and BYOK
- GCS: supports Google-managed encryption, customer-managed encryption keys (CMEK) via Cloud KMS, and customer-supplied encryption keys (CSEK). See: GCS encryption.
- Cellar: supports server-side encryption and provider-managed keys; for BYOK options or external KMS integration validate with Clever Cloud support and documentation.
GDPR, ISO and local compliance
- Both providers offer GDPR compliance features. GCS publishes region-residency and compliance docs: GCP compliance.
- Clever Cloud’s EU-first model and hosting options can simplify data residency obligations for organisations in England and across the EU.
Auditing and logging
- Ensure object-level access logs, bucket ACLs and IAM policies are enabled. For GCS, enable Access Transparency and Cloud Audit Logs. For Cellar, enable available access logs and integrate with SIEM via syslog or object lifecycle notifications.
Operational gaps and migration risks (2025–2026)
- Cross-region replication: GCS offers mature multi-region replication and Object Lifecycle transitions; Cellar replication options may be more limited or require custom pipelines.
- Ecosystem lock-in: moving analytics or ML workloads from GCS back to another provider can be more complex due to tight integrations.
- Testing coverage: run at least two full-scale dry migrations at non-peak hours to measure end-to-end times and validate network egress capacity.
FAQs
Is clever cloud Cellar fully S3 compatible?
Cellar exposes an S3-compatible API for most common operations. Test object PUT/GET and metadata preservation with existing S3 tooling before switching. See Clever Cloud docs: Clever Cloud documentation.
Can GCS act as an S3 endpoint without code changes?
GCS provides interoperability layers and signed URLs, but some S3-specific features or IAM behaviours require adapter code or use of the Google Cloud Storage client libraries. Official guidance: Migration to GCS.
How do costs compare for 10 TB storage in 2026?
Costs depend on region, egress and operations. In many EU-only, low-egress scenarios, Cellar may be ~10–20% cheaper; for heavy egress or integrated analytics, GCS can be more cost-effective due to tiered egress and partner discounts.
What is the realistic downtime for migration?
With a robust dual-write or short write-freeze strategy, downtime can be limited to minutes for cutover. Full migration time depends on network bandwidth and object counts; initial bulk syncs can take hours to days for multi-terabyte datasets.
Does GCS provide stronger SLAs than Cellar?
GCS publishes enterprise SLAs and recovery options; Cellar offers SLAs dependent on the plan. For mission-critical services, review SLA documents and RPO/RTO commitments.
Are lifecycle and tiering features comparable?
Both offer lifecycle policies; GCS provides more granular automatic tier transitions (Nearline, Coldline, Archive) and integration with other GCP services.
Preserve metadata using tools that support metadata copy (rclone, gsutil). Test metadata retention on a representative subset before full migration.
Which is better for GDPR compliance in England?
Both providers support GDPR controls. For strict data residency, choose a provider with EU regional options and documented data processing agreements. Consult legal and security teams before final selection.
Conclusion
The choice between clever cloud Cellar vs Google Cloud Storage depends on priorities: region-focused simplicity and predictable EU pricing favour Cellar, while global scale, integration with analytics/ML and advanced replication favour GCS. For England-based teams, the recommended approach is to run a short proof-of-concept: cost-model 1 TB and 10 TB scenarios, run a scripted rclone migration with checksums, and validate compliance/KMS options with security teams. This pragmatic path closes the common gaps left by general reviews and yields a measurable migration decision.
