feat: docker compose backup

cmd/backup/remote.go

@@ -0,0 +1,33 @@
+package backup
+
+import (
+	"context"
+	"log/slog"
+
+	"git.misaka.ren/M1saka/docker_backup/internal/config"
+	"git.misaka.ren/M1saka/docker_backup/internal/storage"
+)
+
+// uploadToRemotes uploads a backup file to all configured remote backends.
+func uploadToRemotes(ctx context.Context, remote *config.RemoteConfig, projectName, localPath string, logger *slog.Logger) error {
+	backends, err := storage.FromConfig(remote)
+	if err != nil {
+		return err
+	}
+	if len(backends) == 0 {
+		return nil
+	}
+
+	var lastErr error
+	for _, b := range backends {
+		logger.Info("uploading to remote", "project", projectName, "file", localPath)
+		if err := b.Upload(ctx, projectName, localPath); err != nil {
+			logger.Warn("remote upload failed", "project", projectName, "error", err)
+			lastErr = err
+			continue
+		}
+		logger.Info("remote upload complete", "project", projectName)
+	}
+
+	return lastErr
+}