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Cloudstic supports multiple storage backends for maximum flexibility. All backends support encryption, compression, and content-addressed deduplication.

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Available Backends

Local Storage

Store backups on the local filesystem

Amazon S3

S3-compatible storage (AWS, R2, MinIO)

Backblaze B2

Cost-effective cloud storage

SFTP

Remote storage over SSH

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Choosing a Backend

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Local Storage

Best for:
  • Local backups to external drives
  • Fast network-attached storage (NAS)
  • Testing and development

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S3-Compatible

Best for:
  • AWS S3 for scalable cloud storage
  • Cloudflare R2 for zero-egress costs
  • MinIO for self-hosted S3 compatibility

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Backblaze B2

Best for:
  • Cost-effective cloud storage
  • Long-term archival with low storage costs
  • Predictable pricing

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SFTP

Best for:
  • Existing SSH-accessible servers
  • Remote Linux/Unix systems
  • Simple remote backup without cloud setup

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Common Features

All storage backends support:
  • Encryption: AES-256-GCM with key derivation
  • Compression: Automatic zstd compression
  • Deduplication: Content-addressed storage
  • Packfiles: Bundle small objects to reduce API calls
  • Atomic writes: Temporary files with atomic rename

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Configuration

Storage backends are configured via:
  1. Command-line flags (e.g., -store local:/backup)
  2. Environment variables (e.g., CLOUDSTIC_STORE=local:./backup_store)
  3. Per-backend credentials (e.g., B2_KEY_ID, AWS_ACCESS_KEY_ID)
Environment variables are particularly useful for automation and CI/CD pipelines.

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Backend Selection

Specify the storage backend with the -store flag: 
cloudstic init -store local:./backup_store
cloudstic init -store s3:my-bucket
cloudstic init -store b2:my-bucket
cloudstic init -store sftp://user@host/remote/backup

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Next Steps

Local Storage

Set up local filesystem storage

S3 Storage

Configure S3-compatible storage

B2 Storage

Set up Backblaze B2

SFTP Storage

Configure SFTP storage