diff --git a/Duplicati/Library/Main/Controller.cs b/Duplicati/Library/Main/Controller.cs
index 0794710c4..a71a3c8d0 100644
--- a/Duplicati/Library/Main/Controller.cs
+++ b/Duplicati/Library/Main/Controller.cs
@@ -1027,6 +1027,9 @@ namespace Duplicati.Library.Main
                 {
                     return Strings.Controller.UnsupportedSizeValue(optionname, value);
                 }
+
+                if (!string.IsNullOrWhiteSpace(value) && char.IsDigit(value.Last()))
+                    return Strings.Controller.NonQualifiedSizeValue(optionname, value);
             }
             else if (arg.Type == Duplicati.Library.Interface.CommandLineArgument.ArgumentType.Timespan)
             {
diff --git a/Duplicati/Library/Main/Strings.cs b/Duplicati/Library/Main/Strings.cs
index 7862e9b49..131f1e2aa 100644
--- a/Duplicati/Library/Main/Strings.cs
+++ b/Duplicati/Library/Main/Strings.cs
@@ -28,6 +28,7 @@ namespace Duplicati.Library.Main.Strings
         public static string FailedForceLocaleError(string exMsg) { return LC.L(@"Failed to apply 'force-locale' setting. Please try to update .NET-Framework. Exception was: ""{0}"" ", exMsg); }
         public static string SourceVolumeNameInvalidError(string filename) { return LC.L(@"The source {0} uses an invalid volume name, aborting backup", filename); }
         public static string SourceVolumeNameNotFoundError(string filename, Guid volumeGuid) { return LC.L(@"The source {0} is on volume {1}, which could not be found, aborting backup", filename, volumeGuid); }
+        public static string NonQualifiedSizeValue(string optionname, string value) { return LC.L(@"The size ""{1}"" supplied to --{0} does not have a multiplier (b, kb, mb, etc). A multiplier is recommended to avoid unexpected changes if the program is updated.", optionname, value); }
     }
 
     internal static class Options
diff --git a/Duplicati/Library/Modules/Builtin/ResultSerialization/JsonFormatSerializer.cs b/Duplicati/Library/Modules/Builtin/ResultSerialization/JsonFormatSerializer.cs
index f9f9d402a..cd8491f8d 100644
--- a/Duplicati/Library/Modules/Builtin/ResultSerialization/JsonFormatSerializer.cs
+++ b/Duplicati/Library/Modules/Builtin/ResultSerialization/JsonFormatSerializer.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 using Duplicati.Library.Interface;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
@@ -42,7 +43,8 @@ namespace Duplicati.Library.Modules.Builtin.ResultSerialization
             {
                 return base
                     .CreateProperties(type, memberSerialization)
-                    .Where(x => !m_excludes.Contains(x.PropertyName))
+                    .Where(x => !m_excludes.Contains(x.PropertyName))
+                    .Where(x => !typeof(Task).IsAssignableFrom(x.PropertyType))
                     .ToList();
             }
         }
@@ -70,7 +72,8 @@ namespace Duplicati.Library.Modules.Builtin.ResultSerialization
                     ContractResolver = new DynamicContractResolver(
                             nameof(IBasicResults.Warnings),
                             nameof(IBasicResults.Errors),
-                            nameof(IBasicResults.Messages)
+                            nameof(IBasicResults.Messages),
+                            "TaskReader"
                     ),
                     Converters = new List<JsonConverter>()
                     {
diff --git a/Duplicati/Library/Utility/Utility.cs b/Duplicati/Library/Utility/Utility.cs
index 75fc1f0e1..a6077995a 100644
--- a/Duplicati/Library/Utility/Utility.cs
+++ b/Duplicati/Library/Utility/Utility.cs
@@ -1445,6 +1445,11 @@ namespace Duplicati.Library.Utility
                     writer.Write("{0}{1}: ", indentstring, p.Name);
                     PrintSerializeIfPrimitive(p.GetValue(item, null), writer);
                 }
+                else if (typeof(Task).IsAssignableFrom(p.PropertyType) || p.Name == "TaskReader")
+                {
+                    // Ignore Task items
+                    continue;
+                }
                 else if (typeof(System.Collections.IEnumerable).IsAssignableFrom(p.PropertyType))
                 {
                     var enumerable = (System.Collections.IEnumerable)p.GetValue(item, null);
diff --git a/Duplicati/Server/webroot/ngax/scripts/services/AppUtils.js b/Duplicati/Server/webroot/ngax/scripts/services/AppUtils.js
index a12a3a113..39e9519fd 100644
--- a/Duplicati/Server/webroot/ngax/scripts/services/AppUtils.js
+++ b/Duplicati/Server/webroot/ngax/scripts/services/AppUtils.js
@@ -78,7 +78,7 @@ backupApp.service('AppUtils', function($rootScope, $timeout, $cookies, DialogSer
 
     function reloadTexts() {
         apputils.fileSizeMultipliers = [
-            {name: gettextCatalog.getString('byte'), value: ''},
+            {name: gettextCatalog.getString('byte'), value: 'b'},
             {name: gettextCatalog.getString('KByte'), value: 'KB'},
             {name: gettextCatalog.getString('MByte'), value: 'MB'},
             {name: gettextCatalog.getString('GByte'), value: 'GB'},
@@ -111,7 +111,7 @@ backupApp.service('AppUtils', function($rootScope, $timeout, $cookies, DialogSer
         ];
 
         apputils.speedMultipliers = [
-            {name: gettextCatalog.getString('byte/s'), value: ''},
+            {name: gettextCatalog.getString('byte/s'), value: 'b'},
             {name: gettextCatalog.getString('KByte/s'), value: 'KB'},
             {name: gettextCatalog.getString('MByte/s'), value: 'MB'},
             {name: gettextCatalog.getString('GByte/s'), value: 'GB'},