Initial commit: Disaster recovery CLI tool

A Go-based CLI tool for recovering servers from backups to new cloud VMs.

Features:
- Multi-cloud support: Exoscale, Cloudscale, Hetzner Cloud
- Backup sources: Local filesystem, Hetzner Storage Box
- 6-stage restore pipeline with /etc whitelist protection
- DNS migration with safety checks and auto-rollback
- Dry-run by default, requires --yes to execute
- Cloud-init for SSH key injection

Packages:
- cmd/recover-server: CLI commands (recover, migrate-dns, list, cleanup)
- internal/providers: Cloud provider implementations
- internal/backup: Backup source implementations
- internal/restore: 6-stage restore pipeline
- internal/dns: Exoscale DNS management
- internal/ui: Prompts, progress, dry-run display
- internal/config: Environment and host configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/backup/source.go

@@ -0,0 +1,40 @@
+package backup
+
+import (
+	"context"
+	"time"
+)
+
+// BackupInfo contains metadata about a backup
+type BackupInfo struct {
+	Host      string
+	Source    string    // "local" or "hetzner"
+	Path      string    // Full path to backup
+	Timestamp time.Time // Last modified time
+	SizeBytes int64     // Total size
+	HasRoot   bool      // Has /root backup
+	HasOpt    bool      // Has /opt backup
+	HasEtc    bool      // Has /etc backup
+}
+
+// BackupSource defines the interface for backup sources
+type BackupSource interface {
+	// Name returns the source name
+	Name() string
+
+	// List returns available backups for a host (or all hosts if empty)
+	List(ctx context.Context, host string) ([]BackupInfo, error)
+
+	// SyncTo syncs backup data to target VM via rsync over SSH
+	// targetSSH is user@host, sshKeyPath is path to private key
+	SyncTo(ctx context.Context, host string, targetSSH string, sshKeyPath string, dirs []string) error
+
+	// GetPath returns the base path for a host's backup
+	GetPath(host string) string
+
+	// Validate checks if backup source is accessible
+	Validate(ctx context.Context) error
+}
+
+// SupportedDirs lists directories that can be restored
+var SupportedDirs = []string{"root", "opt", "etc"}