diff --git a/backend/Dockerfile b/backend/Dockerfile
index caf7345d9..43ea47d22 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -42,7 +42,7 @@ ENV TZ=UTC \
     AWS_REGION_ASSETS=eu-central-1 \
     CACHE_ASSETS=false \
     ASSETS_SIZE_LIMIT=6291456 \
-    FS_CLEAN_HRS=12
+    FS_CLEAN_HRS=240
 
 
 ARG SERVICE_NAME
diff --git a/backend/pkg/env/vars.go b/backend/pkg/env/vars.go
index 4a3a194b0..a5334b301 100644
--- a/backend/pkg/env/vars.go
+++ b/backend/pkg/env/vars.go
@@ -22,7 +22,7 @@ func Uint64(key string) uint64 {
 	v := String(key)
 	n, err := strconv.ParseUint(v, 10, 64)
 	if err != nil {
-		log.Fatalln(key + " has a wrong value. " + err)
+		log.Fatalln(key + " has a wrong value. ", err)
 	}
 	return n
 }
@@ -31,7 +31,7 @@ func Uint16(key string) uint16 {
 	v := String(key)
 	n, err := strconv.ParseUint(v, 10, 16)
 	if err != nil {
-		log.Fatalln(key + " has a wrong value. " + err)
+		log.Fatalln(key + " has a wrong value. ", err)
 	}
 	return uint16(n)
 }