diff --git a/src/routes/v1/data.ts b/src/routes/v1/data.ts
index 7882e41..27d5ece 100644
--- a/src/routes/v1/data.ts
+++ b/src/routes/v1/data.ts
@@ -1,7 +1,7 @@
 import * as express from 'express'
 import h from '../../utils/errorHelper'
 import { assert } from 'superstruct';
-import { getDataQuery } from '../../validators/data';
+import { getDataQuery, syncDataQuery } from '../../validators/data';
 import APIError from '../../utils/apiError';
 import { createData, getDataFromGroup } from '../../models/data';
 
@@ -27,4 +27,26 @@ router.post("/", h(async (req, res) => {
     res.status(201).json();
 }));
 
+router.post("/sync", h(async (req, res) => {
+    const request = req.body;
+
+    try {
+        assert(request, syncDataQuery);
+    } catch (error) {
+        throw APIError.badRequest(error);
+    }
+
+    const createdEntries = await createData(res.locals.groupId, request.data);
+    const data = await getDataFromGroup(res.locals.groupId, { from: request.lastSync, to: "" });
+
+    // Filter out all doublicates between createdEntries and data
+    const filteredData = data.filter((entry) => {
+        return !createdEntries.some((createdEntry) => {
+            return createdEntry === entry.id;
+        });
+    });
+
+    res.status(createdEntries.length > 0 ? 201 : 200).json(filteredData);
+}));
+
 export default router;
\ No newline at end of file
diff --git a/src/validators/data.ts b/src/validators/data.ts
index 21c77c7..28cde67 100644
--- a/src/validators/data.ts
+++ b/src/validators/data.ts
@@ -13,5 +13,11 @@ export const getDataQuery = s.object({
     to: s.optional(timestamp),
 });
 
+export const syncDataQuery = s.object({
+    lastSync: timestamp,
+    data: s.array(s.any())
+})
+
 export type getDataQueryType = s.Infer<typeof getDataQuery>;
+export type syncDataQueryType = s.Infer<typeof syncDataQuery>;