diff --git a/internal/repository/init.go b/internal/repository/init.go
index 5e9cb6e..826ff1e 100644
--- a/internal/repository/init.go
+++ b/internal/repository/init.go
@@ -228,7 +228,9 @@ func InitDB() error {
 	i := 0
 	errorOccured := 0
 
-	for jobMeta := range ar.Iter() {
+	for jobContainer := range ar.Iter(false) {
+
+		jobMeta := jobContainer.Meta
 
 		// // Bundle 100 inserts into one transaction for better performance:
 		if i%10 == 0 {
diff --git a/pkg/archive/archive.go b/pkg/archive/archive.go
index 5c6a517..48b0790 100644
--- a/pkg/archive/archive.go
+++ b/pkg/archive/archive.go
@@ -30,7 +30,12 @@ type ArchiveBackend interface {
 
 	GetClusters() []string
 
-	Iter() <-chan *schema.JobMeta
+	Iter(loadMetricData bool) <-chan JobContainer
+}
+
+type JobContainer struct {
+	Meta *schema.JobMeta
+	Data *schema.JobData
 }
 
 var cache *lrucache.Cache = lrucache.New(128 * 1024 * 1024)
diff --git a/pkg/archive/fsBackend.go b/pkg/archive/fsBackend.go
index 88432c6..67e82c4 100644
--- a/pkg/archive/fsBackend.go
+++ b/pkg/archive/fsBackend.go
@@ -21,6 +21,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/internal/config"
 	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/santhosh-tekuri/jsonschema/v5"
 )
 
 type FsArchiveConfig struct {
@@ -66,6 +67,40 @@ func loadJobMeta(filename string) (*schema.JobMeta, error) {
 	return DecodeJobMeta(bytes.NewReader(b))
 }
 
+func loadJobData(filename string, isCompressed bool) (schema.JobData, error) {
+	f, err := os.Open(filename)
+
+	if err != nil {
+		log.Errorf("fsBackend LoadJobData()- %v", err)
+		return nil, err
+	}
+
+	if isCompressed {
+		r, err := gzip.NewReader(f)
+		if err != nil {
+			log.Errorf(" %v", err)
+			return nil, err
+		}
+		defer r.Close()
+
+		if config.Keys.Validate {
+			if err := schema.Validate(schema.Data, r); err != nil {
+				return schema.JobData{}, fmt.Errorf("validate job data: %v", err)
+			}
+		}
+
+		return DecodeJobData(r, filename)
+	} else {
+		defer f.Close()
+		if config.Keys.Validate {
+			if err := schema.Validate(schema.Data, bufio.NewReader(f)); err != nil {
+				return schema.JobData{}, fmt.Errorf("validate job data: %v", err)
+			}
+		}
+		return DecodeJobData(bufio.NewReader(f), filename)
+	}
+}
+
 func (fsa *FsArchive) Init(rawConfig json.RawMessage) (int, error) {
 
 	var config FsArchiveConfig
@@ -120,24 +155,8 @@ func (fsa *FsArchive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 		filename = getPath(job, fsa.path, "data.json")
 		isCompressed = false
 	}
-	f, err := os.Open(filename)
 
-	if err != nil {
-		log.Errorf("fsBackend LoadJobData()- %v", err)
-		return nil, err
-	}
-	defer f.Close()
-
-	if isCompressed {
-		r, err := gzip.NewReader(f)
-		if err != nil {
-			log.Errorf(" %v", err)
-			return nil, err
-		}
-		return DecodeJobData(r, filename)
-	} else {
-		return DecodeJobData(bufio.NewReader(f), filename)
-	}
+	return loadJobData(filename, isCompressed)
 }
 
 func (fsa *FsArchive) LoadJobMeta(job *schema.Job) (*schema.JobMeta, error) {
@@ -161,9 +180,9 @@ func (fsa *FsArchive) LoadClusterCfg(name string) (*schema.Cluster, error) {
 	return DecodeCluster(bytes.NewReader(b))
 }
 
-func (fsa *FsArchive) Iter() <-chan *schema.JobMeta {
+func (fsa *FsArchive) Iter(loadMetricData bool) <-chan JobContainer {
 
-	ch := make(chan *schema.JobMeta)
+	ch := make(chan JobContainer)
 	go func() {
 		clustersDir, err := os.ReadDir(fsa.path)
 		if err != nil {
@@ -200,10 +219,26 @@ func (fsa *FsArchive) Iter() <-chan *schema.JobMeta {
 					for _, startTimeDir := range startTimeDirs {
 						if startTimeDir.IsDir() {
 							job, err := loadJobMeta(filepath.Join(dirpath, startTimeDir.Name(), "meta.json"))
-							if err != nil {
+							if err != nil && !errors.Is(err, &jsonschema.ValidationError{}) {
 								log.Errorf("in %s: %s", filepath.Join(dirpath, startTimeDir.Name()), err.Error())
+							}
+
+							if loadMetricData {
+								var isCompressed bool = true
+								filename := filepath.Join(dirpath, startTimeDir.Name(), "data.json.gz")
+
+								if !checkFileExists(filename) {
+									filename = filepath.Join(dirpath, startTimeDir.Name(), "data.json")
+									isCompressed = false
+								}
+
+								data, err := loadJobData(filename, isCompressed)
+								if err != nil && !errors.Is(err, &jsonschema.ValidationError{}) {
+									log.Errorf("in %s: %s", filepath.Join(dirpath, startTimeDir.Name()), err.Error())
+								}
+								ch <- JobContainer{Meta: job, Data: &data}
 							} else {
-								ch <- job
+								ch <- JobContainer{Meta: job, Data: nil}
 							}
 						}
 					}
diff --git a/pkg/archive/fsBackend_test.go b/pkg/archive/fsBackend_test.go
index 72055e6..9fce359 100644
--- a/pkg/archive/fsBackend_test.go
+++ b/pkg/archive/fsBackend_test.go
@@ -154,10 +154,10 @@ func TestIter(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	for job := range fsa.Iter() {
-		fmt.Printf("Job %d\n", job.JobID)
+	for job := range fsa.Iter(false) {
+		fmt.Printf("Job %d\n", job.Meta.JobID)
 
-		if job.Cluster != "emmy" {
+		if job.Meta.Cluster != "emmy" {
 			t.Fail()
 		}
 	}
diff --git a/pkg/schema/schemas/job-metric-data.schema.json b/pkg/schema/schemas/job-metric-data.schema.json
index 6107486..3f2b934 100644
--- a/pkg/schema/schemas/job-metric-data.schema.json
+++ b/pkg/schema/schemas/job-metric-data.schema.json
@@ -193,7 +193,7 @@
                     },
                     "data": {
                         "type": "array",
-                        "items": {
+                        "contains": {
                             "type": "number",
                             "minimum": 0
                         },
diff --git a/tools/archive-manager/main.go b/tools/archive-manager/main.go
index 8974ee0..ea1824c 100644
--- a/tools/archive-manager/main.go
+++ b/tools/archive-manager/main.go
@@ -29,7 +29,7 @@ func main() {
 	}
 	ar := archive.GetHandle()
 
-	for jobMeta := range ar.Iter() {
-		log.Printf("Validate %s - %d\n", jobMeta.Cluster, jobMeta.JobID)
+	for job := range ar.Iter(true) {
+		log.Printf("Validate %s - %d\n", job.Meta.Cluster, job.Meta.JobID)
 	}
 }