diff --git a/api-server/src/main/openapi/openapi.yml b/api-server/src/main/openapi/openapi.yml
index 41a50b1..8937c2d 100644
--- a/api-server/src/main/openapi/openapi.yml
+++ b/api-server/src/main/openapi/openapi.yml
@@ -154,7 +154,7 @@ paths:
             application/zip:
               schema:
                 type: string
-                format: binary
+                format: byte
         400:
           description: Content backup was not retrieved
   /v1/content/object/clean:
diff --git a/cli/src/main/java/com/objectstorage/service/client/content/download/backup/DownloadContentBackupClientService.java b/cli/src/main/java/com/objectstorage/service/client/content/download/backup/DownloadContentBackupClientService.java
index b219283..1e9f767 100644
--- a/cli/src/main/java/com/objectstorage/service/client/content/download/backup/DownloadContentBackupClientService.java
+++ b/cli/src/main/java/com/objectstorage/service/client/content/download/backup/DownloadContentBackupClientService.java
@@ -14,12 +14,10 @@
 import org.springframework.web.reactive.function.client.WebClientResponseException;
 import reactor.netty.http.client.HttpClient;
 
-import java.io.File;
-
 /**
  * Represents implementation for v1ContentBackupDownloadPost endpoint of ContentResourceApi.
  */
-public class DownloadContentBackupClientService implements IClient<File, ContentDownloadBackupRequestDto> {
+public class DownloadContentBackupClientService implements IClient<byte[], ContentDownloadBackupRequestDto> {
     private final ContentResourceApi contentResourceApi;
 
     public DownloadContentBackupClientService(String host) {
@@ -40,7 +38,7 @@ public DownloadContentBackupClientService(String host) {
      * @see IClient
      */
     @Override
-    public File process(ContentDownloadBackupRequestDto input) throws ApiServerOperationFailureException {
+    public byte[] process(ContentDownloadBackupRequestDto input) throws ApiServerOperationFailureException {
         try {
             return contentResourceApi
                     .v1ContentBackupDownloadPost(
diff --git a/cli/src/main/java/com/objectstorage/service/command/external/download/backup/DownloadBackupExternalCommandService.java b/cli/src/main/java/com/objectstorage/service/command/external/download/backup/DownloadBackupExternalCommandService.java
index 96aede3..800dfe9 100644
--- a/cli/src/main/java/com/objectstorage/service/command/external/download/backup/DownloadBackupExternalCommandService.java
+++ b/cli/src/main/java/com/objectstorage/service/command/external/download/backup/DownloadBackupExternalCommandService.java
@@ -121,12 +121,11 @@ public void process(DownloadBackupExternalCommandDto downloadBackupExternalComma
                 validationSecretsApplicationResult.getToken(),
                 ContentBackupDownload.of(downloadBackupExternalCommand.getLocation()));
 
-        File contentBackupDownloadResult = downloadContentBackupClientService.process(request);
+        byte[] contentBackupDownloadResult = downloadContentBackupClientService.process(request);
 
         try {
             FileUtils.writeByteArrayToFile(
-                    new File(downloadBackupExternalCommand.getOutputLocation()),
-                    Files.readAllBytes(contentBackupDownloadResult.toPath()));
+                    new File(downloadBackupExternalCommand.getOutputLocation()), contentBackupDownloadResult);
         } catch (IOException e) {
             throw new ApiServerOperationFailureException(e.getMessage());
         }