Added backups of all data, restorable on another computer (#1008)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/PathTools.cs

@@ -0,0 +1,45 @@
+namespace AIStudio.Tools;
+
+/// <summary>
+/// Shared rules for comparing file system paths.
+/// </summary>
+public static class PathTools
+{
+    /// <summary>
+    /// How to compare file system paths: Windows treats them case-insensitively, Linux and
+    /// macOS do not. There, two files may differ in casing alone.
+    /// </summary>
+    public static readonly StringComparison COMPARISON = OperatingSystem.IsWindows() ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal;
+
+    /// <summary>
+    /// The comparer matching COMPARISON, for path-keyed lookups.
+    /// </summary>
+    public static readonly StringComparer COMPARER = OperatingSystem.IsWindows() ? StringComparer.OrdinalIgnoreCase : StringComparer.Ordinal;
+
+    /// <summary>
+    /// Determines whether a path lies below the given directory.
+    /// </summary>
+    /// <remarks>
+    /// The directory itself does not count as lying below itself. A path which cannot be resolved
+    /// counts as lying elsewhere.
+    /// </remarks>
+    /// <param name="directory">The directory.</param>
+    /// <param name="path">The path to check.</param>
+    /// <returns>Whether the path lies below the directory.</returns>
+    public static bool IsInsideDirectory(string directory, string path)
+    {
+        try
+        {
+            var fullDirectory = Path.GetFullPath(directory);
+            var directoryPrefix = fullDirectory.EndsWith(Path.DirectorySeparatorChar)
+                ? fullDirectory
+                : fullDirectory + Path.DirectorySeparatorChar;
+
+            return Path.GetFullPath(path).StartsWith(directoryPrefix, COMPARISON);
+        }
+        catch (Exception exception) when (exception is ArgumentException or NotSupportedException or PathTooLongException)
+        {
+            return false;
+        }
+    }
+}