dbbackup/RELEASE_NOTES.md

v3.42.0 Release Notes

What's New in v3.42.0

Deduplication - Resistance is Futile

Content-defined chunking deduplication for space-efficient backups. Like restic/borgbackup but with native database dump support.

# First backup: 5MB stored
dbbackup dedup backup mydb.dump

# Second backup (modified): only 1.6KB new data stored!
# 100% deduplication ratio
dbbackup dedup backup mydb_modified.dump

Features

• Gear Hash CDC - Content-defined chunking with 92%+ overlap on shifted data
• SHA-256 Content-Addressed - Chunks stored by hash, automatic deduplication
• AES-256-GCM Encryption - Optional per-chunk encryption
• Gzip Compression - Optional compression (enabled by default)
• SQLite Index - Fast chunk lookups and statistics

Commands

dbbackup dedup backup <file>              # Create deduplicated backup
dbbackup dedup backup <file> --encrypt    # With AES-256-GCM encryption
dbbackup dedup restore <id> <output>      # Restore from manifest
dbbackup dedup list                       # List all backups
dbbackup dedup stats                      # Show deduplication statistics
dbbackup dedup delete <id>                # Delete a backup
dbbackup dedup gc                         # Garbage collect unreferenced chunks

Storage Structure

<backup-dir>/dedup/
  chunks/           # Content-addressed chunk files
    ab/cdef1234...  # Sharded by first 2 chars of hash
  manifests/        # JSON manifest per backup
  chunks.db         # SQLite index

Also Included (from v3.41.x)

• Systemd Integration - One-command install with dbbackup install
• Prometheus Metrics - HTTP exporter on port 9399
• Backup Catalog - SQLite-based tracking of all backup operations
• Prometheus Alerting Rules - Added to SYSTEMD.md documentation

Installation

Quick Install (Recommended)

# Download for your platform
curl -LO https://git.uuxo.net/UUXO/dbbackup/releases/download/v3.42.0/dbbackup-linux-amd64

# Install with systemd service
chmod +x dbbackup-linux-amd64
sudo ./dbbackup-linux-amd64 install --config /path/to/config.yaml

Available Binaries

Platform	Architecture	Binary
Linux	amd64	dbbackup-linux-amd64
Linux	arm64	dbbackup-linux-arm64
macOS	Intel	dbbackup-darwin-amd64
macOS	Apple Silicon	dbbackup-darwin-arm64
FreeBSD	amd64	dbbackup-freebsd-amd64

Systemd Commands

dbbackup install --config config.yaml   # Install service + timer
dbbackup install --status               # Check service status
dbbackup install --uninstall            # Remove services

Prometheus Metrics

Available at http://localhost:9399/metrics:

Metric	Description
dbbackup_last_backup_timestamp	Unix timestamp of last backup
dbbackup_last_backup_success	1 if successful, 0 if failed
dbbackup_last_backup_duration_seconds	Duration of last backup
dbbackup_last_backup_size_bytes	Size of last backup
dbbackup_backup_total	Total number of backups
dbbackup_backup_errors_total	Total number of failed backups

Security Features

• Hardened systemd service with ProtectSystem=strict
• NoNewPrivileges=true prevents privilege escalation
• Dedicated dbbackup system user (optional)
• Credential files with restricted permissions

Documentation

• SYSTEMD.md - Complete systemd installation guide
• README.md - Full documentation
• CHANGELOG.md - Version history

Bug Fixes

• Fixed SQLite time parsing in dedup stats
• Fixed function name collision in cmd package

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Full Changelog: https://git.uuxo.net/UUXO/dbbackup/compare/v3.41.1...v3.42.0