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S3 Migration, Sync & Backup

Migrate, sync, and back up S3 storage with proof every run finished

Godwit Sync is a plan-first tool to migrate, sync, and back up S3-compatible object storage. Move only what changed between any S3 stores or from a local server, keep every version as a plain S3 object, and get proof every run finished with checksum verification and crash-safe resume.

Get StartedSee How It Works

Latest post

Migrate MinIO IAM to RustFS (2026): Users, Policies, and Access Keys

Move MinIO users, policies, and access keys to RustFS: in-place, or by export/import to a new host. LDAP, OIDC, lifecycle rules, and bucket notifications don't transfer.

Read more

Core Capabilities

Reliable S3 transfers, verified end to end

Every run is controlled, resumable, and verifiable.

01

Version History

Migrate all object versions

02

Point-in-Time Restore

Roll back to any instant

03

Resumable

Continue from exact checkpoint

04

Incremental Sync

Transfer only what changed, and prove the run finished

Plan-First Approach

Plan Before You Move

Know exactly what will happen before any data moves. Generate migration plans, inspect them, modify as needed, and execute with confidence.

  • Deterministic migration plan generation (--plan-only)
  • Migration plans stored in SQLite
  • Inspect, modify, and reuse plans
  • Predictable execution every time
$ godwit sync \
    --source s3://production-bucket \
    --destination s3://backup-bucket \
    --plan-only --brief

────────────────────────────────────────
  PLAN CREATED
────────────────────────────────────────
  ✓ Run-ID: run-1770316589731184186
  ✓ Objects analyzed: 685,234
  ✓ Objects to transfer: 620,205
  ✓ Objects skipped: 65,029
  ✓ Data to transfer: 40.03 GB
  ✓ Data skipped: 4.7 GB
────────────────────────────────────────

End-to-End Checksums

Validate every object with real MD5 hashes, not just ETAGs.

Deterministic Runs

Identical inputs produce identical results, with no hidden randomness.

Parallel, Controlled Transfers

High throughput without sacrificing stability or safety.

Metadata Fidelity

Preserve object metadata exactly as stored at the source.

Chunk-Level Recovery

Recover from partial uploads without corrupting large files.

Object Lock Preservation

Replicate GOVERNANCE/COMPLIANCE retention and legal hold settings per version.

Production Safety

Production-Safe by Design

Built for environments where downtime and data loss are not options. Rate-limit operations, resume from any point, and keep your source systems healthy.

  • Rate-limited reads and writes
  • True stream-to-stream copy (no local staging)
  • Resume from exact file or chunk
  • Large file stability
  • No overload of source systems
Backup & Version History

Every version, verified byte for byte

Back up local server directories or migrate S3 buckets without losing version history. Godwit Sync keeps every version, writes each change as a new S3 object version, verifies checksums, skips Glacier-class versions, and preserves Object Lock retention.

  • Back up a local server directory to any S3-compatible bucket with incremental runs
  • Migrate full or partial S3 bucket version history
  • Store each change as a new S3 object version, never overwriting older versions
  • Verify every version with .md5 sidecars and godwit plan verify
  • Skip Glacier-class versions and preserve Object Lock retention and legal hold
# Plan a full version history migration
$ godwit sync \
    --source s3://prod-bucket \
    --source-endpoint s3.amazonaws.com \
    --source-access-key <SOURCE_ACCESS_KEY> \
    --source-secret-key <SOURCE_SECRET_KEY> \
    --destination s3://archive-bucket \
    --destination-endpoint s3.amazonaws.com \
    --destination-access-key <DESTINATION_ACCESS_KEY> \
    --destination-secret-key <DESTINATION_SECRET_KEY> \
    --state-path ./godwit.state.db \
    --run-id version-history-prod \
    --version-mode all --object-lock --plan-only

Planning...

⚠ Warning: 9 GLACIER objects detected.
  Restore required before migration.

────────────────────────────────────────
  PLAN CREATED
────────────────────────────────────────
  ✓ Run-ID: version-history-prod
  ✓ Objects analyzed: 23
  ✓ Objects to transfer: 14
  ✓ Objects skipped: 9
  ✓ Data to transfer: 48.20 GB
────────────────────────────────────────
# Preview a point-in-time restore of the bucket as of 02:00
$ godwit sync \
    --source s3://prod-bucket \
    --source-endpoint s3.amazonaws.com \
    --source-access-key <SOURCE_ACCESS_KEY> \
    --source-secret-key <SOURCE_SECRET_KEY> \
    --destination /restore/2am \
    --state-path ./godwit.state.db \
    --run-id pitr-2am \
    --version-mode asof:2026-06-01T02:00:00Z --plan-only

Planning...

────────────────────────────────────────
  PLAN CREATED
────────────────────────────────────────
  ✓ Run-ID: pitr-2am
  ✓ Objects analyzed: 1,268
  ✓ Objects to transfer: 1,204
  ✓ Objects skipped: 64
  ✓ Data to transfer: 62.40 GB
────────────────────────────────────────
Point-in-Time Restore

Rewind a bucket or prefix to any point in time

Reconstruct a bucket, a prefix, or a single object as it was at a chosen instant. Godwit Sync selects the version of each key that was live at your cutoff and writes it as the current object, so your data returns to that moment in one command.

  • One command; absolute time or asof:30d
  • Restores to a filesystem or plain bucket
  • Skips keys deleted or created after cutoff
  • Cutoff uses the source server's clock
Incremental Sync

Sync Only What Changed

The first run is a full sync; every later run compares each source object against confirmed-completed metadata and transfers only what changed, with no destination re-scan. Each run exposes a status endpoint and exit code so automation can confirm it finished.

  • Size+ETag change detection
  • Portable .md5 checksum sidecars
  • Crash-safe confirmed baseline
  • Proof every run finished
  • Preview delta with --plan-only
# Incremental sync transfers only what changed
$ godwit sync \
    --source s3://prod \
    --source-endpoint prod-rustfs:9000 \
    --source-access-key <SOURCE_ACCESS_KEY> \
    --source-secret-key <SOURCE_SECRET_KEY> \
    --destination s3://backup \
    --destination-endpoint backup-rustfs:9000 \
    --destination-access-key <DESTINATION_ACCESS_KEY> \
    --destination-secret-key <DESTINATION_SECRET_KEY> \
    --state-path ./godwit.state.db \
    --run-id daily-backup \
    --incremental --override --brief

────────────────────────────────────────
  PLAN READY
────────────────────────────────────────
  ✓ Run-ID: daily-backup
  ✓ Objects analyzed: 500,234
  ✓ Objects to transfer: 1,072
  ✓ Objects skipped: 499,162
  ✓ Data to transfer: 890 MB
  ✓ Data skipped: 1.4 TB
────────────────────────────────────────
  RUN COMPLETED
────────────────────────────────────────
  ✓ Run-ID: daily-backup
  ✓ Objects transferred: 1,072
  ✓ Data transferred: 890 MB
  ✓ Total time: 47s
────────────────────────────────────────
Status Endpoint
JSON endpoint for real-time sync progress: objects, bytes, ETA, storage class breakdown, and Object Lock statistics.
Learn more
Prometheus Metrics
Counters, histograms, and gauges for deep observability, including Object Lock retention and legal hold counts. Plug into Grafana or any Prometheus-compatible stack.
Learn more
Full Observability

Observable & Verifiable

Know exactly what's happening at every moment. Integrate with your existing monitoring stack and verify every byte after it lands.

  • Verbose CLI UI with real-time progress
  • REST status endpoint
  • Prometheus-compatible metrics
  • Predictable duration and progress estimates
  • Built-in MD5 verify after every transfer

Data Movement, Done Right

Godwit Sync turns risky storage migrations into planned, observable, production-safe workflows for modern infrastructure teams.

Plan-First Execution
Preview changes before they happen. No surprises in production.
Operational Transparency
Built-in metrics and monitoring. Integrate with your existing stack.
CLI as an API
Scriptable, automatable, and CI/CD ready from day one.
Incremental by Design
Change detection uses object metadata, not clocks. A crashed previous run never silently skips unfinished objects.
Predictable Cost & Time
Know transfer times and resource usage before you start, for both full migrations and incremental runs.
Hybrid & On-Prem Ready
Works with any S3-compatible storage, cloud or self-hosted.
Migration path

Leaving MinIO? Move to S3, RustFS, or Ceph without losing the shape of your data.

Keep version history, Object Lock, checksum verification, and resumable transfers while moving away from a storage stack in maintenance mode.

Plan a migrationRead the guide
Offsite backup

Back up to S3 as plain objects.

Every version remains a normal object you can inspect and restore with familiar S3-compatible tools.

See backup flow
Godwit Sync

Production-grade S3 migration and ongoing synchronization. Control, predictability, and safety at scale.

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