diff --git a/backend/src/modules/users/services/users.service.ts b/backend/src/modules/users/services/users.service.ts
index 9ed5026..91f0f01 100644
--- a/backend/src/modules/users/services/users.service.ts
+++ b/backend/src/modules/users/services/users.service.ts
@@ -1,5 +1,5 @@
 import { Injectable, NotFoundException, Inject } from '@nestjs/common';
-import { eq } from 'drizzle-orm';
+import { eq, inArray } from 'drizzle-orm';
 import { DRIZZLE } from '../../../database/database.module';
 import * as schema from '../../../database/schema';
 import { CreateUserDto } from '../dto/create-user.dto';
@@ -111,17 +111,59 @@ export class UsersService {
    */
   async exportUserData(id: string) {
     const user = await this.findById(id);
+
+    // Get all projects owned by the user
     const projects = await this.db
       .select()
       .from(schema.projects)
       .where(eq(schema.projects.ownerId, id));
 
-    // Add empty groups and persons arrays for compatibility with tests
+    // Get all project IDs
+    const projectIds = projects.map(project => project.id);
+
+    // Get all persons in user's projects
+    const persons = projectIds.length > 0 
+      ? await this.db
+          .select()
+          .from(schema.persons)
+          .where(inArray(schema.persons.projectId, projectIds))
+      : [];
+
+    // Get all groups in user's projects
+    const groups = projectIds.length > 0
+      ? await this.db
+          .select()
+          .from(schema.groups)
+          .where(inArray(schema.groups.projectId, projectIds))
+      : [];
+
+    // Get all project collaborations where the user is a collaborator
+    const collaborations = await this.db
+      .select({
+        collaboration: schema.projectCollaborators,
+        project: schema.projects
+      })
+      .from(schema.projectCollaborators)
+      .innerJoin(
+        schema.projects,
+        eq(schema.projectCollaborators.projectId, schema.projects.id)
+      )
+      .where(eq(schema.projectCollaborators.userId, id));
+
     return {
       user,
       projects,
-      groups: [],
-      persons: []
+      groups,
+      persons,
+      collaborations: collaborations.map(c => ({
+        id: c.collaboration.id,
+        projectId: c.collaboration.projectId,
+        project: {
+          id: c.project.id,
+          name: c.project.name,
+          description: c.project.description
+        }
+      }))
     };
   }
 }