diff --git a/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceRequestDto.cs b/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceRequestDto.cs
new file mode 100644
index 000000000..9d1d5e5b0
--- /dev/null
+++ b/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceRequestDto.cs
@@ -0,0 +1,32 @@
+// Copyright (C) 2025, The Duplicati Team
+// https://duplicati.com, hello@duplicati.com
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a 
+// copy of this software and associated documentation files (the "Software"), 
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in 
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+// DEALINGS IN THE SOFTWARE.
+namespace Duplicati.WebserverCore.Dto.V2;
+
+/// <summary>
+/// The temporary disk space request DTO
+/// </summary>
+public sealed record TempDiskSpaceRequestDto
+{
+    /// <summary>
+    /// The backup ID, if known. If provided, the system will check for a temp folder override in the backup settings.
+    /// </summary>
+    public string? BackupId { get; init; }
+}
diff --git a/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceResponseDto.cs b/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceResponseDto.cs
new file mode 100644
index 000000000..435350dd4
--- /dev/null
+++ b/Duplicati/WebserverCore/Dto/V2/TempDiskSpaceResponseDto.cs
@@ -0,0 +1,100 @@
+// Copyright (C) 2025, The Duplicati Team
+// https://duplicati.com, hello@duplicati.com
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a 
+// copy of this software and associated documentation files (the "Software"), 
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in 
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+// DEALINGS IN THE SOFTWARE.
+namespace Duplicati.WebserverCore.Dto.V2;
+
+/// <summary>
+/// The temporary disk space response DTO
+/// </summary>
+public sealed record TempDiskSpaceResponseDto : ResponseEnvelope<TempDiskSpaceResult>
+{
+    /// <summary>
+    /// Creates a success response with the temp disk space information
+    /// </summary>
+    /// <param name="tempPath">The path to the temporary folder</param>
+    /// <param name="freeSpace">The free space in bytes</param>
+    /// <param name="totalSpace">The total space in bytes</param>
+    /// <returns>The response DTO</returns>
+    public static TempDiskSpaceResponseDto Create(string tempPath, long? freeSpace, long? totalSpace, long dblockSize, long restoreCacheMax)
+    {
+        return new TempDiskSpaceResponseDto()
+        {
+            Success = true,
+            Error = null,
+            StatusCode = "OK",
+            Data = new TempDiskSpaceResult()
+            {
+                TempPath = tempPath,
+                FreeSpace = freeSpace,
+                TotalSpace = totalSpace,
+                DblockSize = dblockSize,
+                RestoreCacheMax = restoreCacheMax
+            }
+        };
+    }
+
+    /// <summary>
+    /// Creates a failure response
+    /// </summary>
+    /// <param name="error">The error message</param>
+    /// <param name="statusCode">The status code</param>
+    /// <returns>The response DTO</returns>
+    public static new TempDiskSpaceResponseDto Failure(string error, string statusCode)
+    {
+        return new TempDiskSpaceResponseDto()
+        {
+            Success = false,
+            Error = error,
+            StatusCode = statusCode,
+            Data = null
+        };
+    }
+}
+
+/// <summary>
+/// The temporary disk space result
+/// </summary>
+public sealed record TempDiskSpaceResult
+{
+    /// <summary>
+    /// The path to the temporary folder that was checked
+    /// </summary>
+    public required string TempPath { get; init; }
+
+    /// <summary>
+    /// The free space available in bytes, or null if it could not be determined
+    /// </summary>
+    public required long? FreeSpace { get; init; }
+
+    /// <summary>
+    /// The total space of the drive in bytes, or null if it could not be determined
+    /// </summary>
+    public required long? TotalSpace { get; init; }
+
+    /// <summary>
+    /// The dblock-size setting in bytes
+    /// </summary>
+    public required long DblockSize { get; init; }
+
+    /// <summary>
+    /// The restore-cache-max setting in bytes
+    /// </summary>
+    public required long RestoreCacheMax { get; init; }
+}
diff --git a/Duplicati/WebserverCore/Endpoints/V2/TempDiskSpace.cs b/Duplicati/WebserverCore/Endpoints/V2/TempDiskSpace.cs
new file mode 100644
index 000000000..efe474b1a
--- /dev/null
+++ b/Duplicati/WebserverCore/Endpoints/V2/TempDiskSpace.cs
@@ -0,0 +1,147 @@
+// Copyright (C) 2025, The Duplicati Team
+// https://duplicati.com, hello@duplicati.com
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a 
+// copy of this software and associated documentation files (the "Software"), 
+// to deal in the Software without restriction, including without limitation 
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in 
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+// DEALINGS IN THE SOFTWARE.
+
+using Duplicati.Library.Utility;
+using Duplicati.Server.Database;
+using Duplicati.WebserverCore.Abstractions;
+using Duplicati.WebserverCore.Dto.V2;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Duplicati.WebserverCore.Endpoints.V2;
+
+/// <summary>
+/// Endpoint for checking temporary disk space
+/// </summary>
+public class TempDiskSpace : IEndpointV2
+{
+    /// <summary>
+    /// Maps the endpoint routes
+    /// </summary>
+    /// <param name="group">The route group builder</param>
+    public static void Map(RouteGroupBuilder group)
+    {
+        group.MapPost("/system/temp-disk-space", ([FromServices] Connection connection, [FromBody] TempDiskSpaceRequestDto input)
+            => Execute(connection, input))
+            .RequireAuthorization();
+    }
+
+    /// <summary>
+    /// Executes the temp disk space check
+    /// </summary>
+    /// <param name="connection">The database connection</param>
+    /// <param name="input">The request input</param>
+    /// <returns>The response DTO</returns>
+    private static TempDiskSpaceResponseDto Execute(Connection connection, TempDiskSpaceRequestDto input)
+    {
+        try
+        {
+            // Get the merged options for the backup (or defaults)
+            var options = GetMergedOptions(connection, input.BackupId);
+
+            // Determine the temp folder path from the merged options
+            var tempPath = GetTempPath(options);
+
+            // Get the free space for the temp path
+            var spaceInfo = Utility.GetFreeSpaceForPath(tempPath);
+
+            // Get the default options
+            var defaultOptions = new Library.Main.Options(new Dictionary<string, string?>());
+
+            // Get dblock-size and restore-cache-max from the options
+            var dblockSize = Sizeparser.ParseSize(
+                options.TryGetValue("dblock-size", out var dblockVal) && !string.IsNullOrWhiteSpace(dblockVal)
+                    ? dblockVal
+                    : $"{defaultOptions.VolumeSize}b",
+                "mb");
+
+            var restoreCacheMax = Sizeparser.ParseSize(
+                options.TryGetValue("restore-cache-max", out var cacheVal) && !string.IsNullOrWhiteSpace(cacheVal)
+                    ? cacheVal
+                    : $"{defaultOptions.RestoreCacheMax}b",
+                "mb");
+
+            return TempDiskSpaceResponseDto.Create(
+                tempPath: tempPath,
+                freeSpace: spaceInfo?.FreeSpace,
+                totalSpace: spaceInfo?.TotalSpace,
+                dblockSize: dblockSize,
+                restoreCacheMax: restoreCacheMax
+            );
+        }
+        catch (Exception ex)
+        {
+            return TempDiskSpaceResponseDto.Failure(
+                error: ex.Message,
+                statusCode: "error-checking-temp-space"
+            );
+        }
+    }
+
+    /// <summary>
+    /// Gets the merged options dictionary, combining application-level settings
+    /// with backup-specific settings (if a backupId is provided).
+    /// </summary>
+    /// <param name="connection">The database connection</param>
+    /// <param name="backupId">The optional backup ID</param>
+    /// <returns>The merged options dictionary</returns>
+    private static Dictionary<string, string?> GetMergedOptions(Connection connection, string? backupId)
+    {
+        // Start with application-level settings (ANY_BACKUP_ID)
+        var options = connection.Settings
+            .GroupBy(
+                k => k.Name.StartsWith("--", StringComparison.Ordinal) ? k.Name.Substring(2) : k.Name,
+                k => (string?)k.Value
+            )
+            .ToDictionary(g => g.Key, g => g.FirstOrDefault());
+
+        // If a backupId is provided, overlay the backup-specific settings
+        if (!string.IsNullOrWhiteSpace(backupId))
+        {
+            var backup = connection.GetBackup(backupId);
+            if (backup?.Settings != null)
+            {
+                foreach (var setting in backup.Settings)
+                {
+                    var name = setting.Name.StartsWith("--", StringComparison.Ordinal)
+                        ? setting.Name.Substring(2)
+                        : setting.Name;
+                    options[name] = setting.Value;
+                }
+            }
+        }
+
+        return options;
+    }
+
+    /// <summary>
+    /// Gets the temporary folder path from the merged options.
+    /// Falls back to the system default temp path if no override is configured.
+    /// </summary>
+    /// <param name="options">The merged options dictionary</param>
+    /// <returns>The temp folder path</returns>
+    private static string GetTempPath(Dictionary<string, string?> options)
+    {
+        if (options.TryGetValue("tempdir", out var tempDir) && !string.IsNullOrWhiteSpace(tempDir))
+            return tempDir;
+
+        return TempFolder.SystemTempPath;
+    }
+}
diff --git a/Duplicati/WebserverCore/Services/SystemInfoProvider.cs b/Duplicati/WebserverCore/Services/SystemInfoProvider.cs
index 999717d7a..af7047d9e 100644
--- a/Duplicati/WebserverCore/Services/SystemInfoProvider.cs
+++ b/Duplicati/WebserverCore/Services/SystemInfoProvider.cs
@@ -56,6 +56,7 @@ public class SystemInfoProvider(IApplicationSettings applicationSettings, Connec
         "v1:subscribe:taskqueue",
         "v1:subscribe:taskcompleted",
         "v1:subscribe:notifications",
+        "v2:system:temp-disk-space",
 
         // "v1:subscribe:scheduler",
     ];