diff --git a/Duplicati/Library/Main/Volumes/VolumeBase.cs b/Duplicati/Library/Main/Volumes/VolumeBase.cs
index a92e58bd2..cd00cbdf1 100644
--- a/Duplicati/Library/Main/Volumes/VolumeBase.cs
+++ b/Duplicati/Library/Main/Volumes/VolumeBase.cs
@@ -6,10 +6,10 @@ namespace Duplicati.Library.Main.Volumes
 {
     public abstract class VolumeBase
     {
-        protected class FilesetData
+        public class FilesetData
         {
             [JsonProperty("IsFullBackup")]
-            public bool? IsFullBackup { get; set; }
+            public bool IsFullBackup { get; set; } = true;
 
             public static string GetFilesetInstance(bool isFullBackup = true)
             {
diff --git a/Duplicati/Library/Main/Volumes/VolumeWriterBase.cs b/Duplicati/Library/Main/Volumes/VolumeWriterBase.cs
index ab152bd09..d28e16628 100644
--- a/Duplicati/Library/Main/Volumes/VolumeWriterBase.cs
+++ b/Duplicati/Library/Main/Volumes/VolumeWriterBase.cs
@@ -1,7 +1,6 @@
-using Duplicati.Library.Interface;
-using Duplicati.Library.Utility;
-using System;
+using System;
 using System.IO;
+using Duplicati.Library.Interface;
 
 namespace Duplicati.Library.Main.Volumes
 {
@@ -63,15 +62,23 @@ namespace Duplicati.Library.Main.Volumes
             if ((this is IndexVolumeWriter || this is FilesetVolumeWriter) && m_compression is Library.Interface.ICompressionHinting)
                 ((Library.Interface.ICompressionHinting)m_compression).LowOverheadMode = true;
 
-            AddManifestfile();
+            AddManifestFile();
         }
 
-        protected void AddManifestfile()
+        protected void AddManifestFile()
         {
             using (var sr = new StreamWriter(m_compression.CreateFile(MANIFEST_FILENAME, CompressionHint.Compressible, DateTime.UtcNow), ENCODING))
                 sr.Write(ManifestData.GetManifestInstance(m_blocksize, m_blockhash, m_filehash));
         }
 
+        public void CreateFilesetFile(bool isFullBackup)
+        {
+            using (var sr = new StreamWriter(m_compression.CreateFile(FILESET_FILENAME, CompressionHint.Compressible, DateTime.UtcNow), ENCODING))
+            {
+                sr.Write(FilesetData.GetFilesetInstance(isFullBackup));
+            }
+        }
+
         public virtual void Dispose()
         {
             if (m_compression != null)