diff --git a/backend/data.ts b/backend/data.ts
index 730f0bd..817c20d 100644
--- a/backend/data.ts
+++ b/backend/data.ts
@@ -101,3 +101,48 @@ export const setDataModeToSql = (): Promise<void> => new Promise(async (resolve,
 	await bothWriter(files, users);
 	(issue) ? reject(new Error(issue)) : resolve(void 0);
 });
+
+export const put = (sector: DataSector, key: NID, data: AssFile | AssUser): Promise<void> => new Promise(async (resolve, reject) => {
+	try {
+		const useSql = false;
+
+		if (sector === 'files') {
+			data = data as AssFile;
+
+			// * 1: Save as files (image, video, etc)
+			const filesJson = await fs.readJson(PATHS.files) as FilesSchema;
+
+			// Check if key already exists
+			if (filesJson.files[key] != null) return reject(new Error(`File key ${key} already exists`));
+
+			// Otherwise add the data
+			filesJson.files[key] = data;
+
+			// Also save the key to the users file
+			const usersJson = await fs.readJson(PATHS.users) as UsersSchema;
+			// todo: uncomment this once users are implemented
+			// usersJson.users[data.uploader].files.push(key);
+
+			// Save the files
+			await bothWriter(filesJson, usersJson);
+		} else {
+			data = data as AssUser;
+
+			// * 2: Save as users
+			const usersJson = await fs.readJson(PATHS.users) as UsersSchema;
+
+			// Check if key already exists
+			if (usersJson.users[key] != null) return reject(new Error(`User key ${key} already exists`));
+
+			// Otherwise add the data
+			usersJson.users[key] = data;
+
+			await fs.writeJson(PATHS.users, usersJson, { spaces: '\t' });
+		}
+
+		log.info(`PUT data (${useSql ? 'SQL' : 'local JSON'})`, `${key}`, `${sector} sector`);
+		resolve(void 0);
+	} catch (err) {
+		reject(err);
+	}
+});
diff --git a/backend/routers/index.ts b/backend/routers/index.ts
index c323e47..f64c576 100644
--- a/backend/routers/index.ts
+++ b/backend/routers/index.ts
@@ -1,13 +1,13 @@
 import fs from 'fs-extra';
 import bb from 'express-busboy';
 import { Router } from 'express';
-import { nanoid } from 'nanoid';
 import { log } from '../log';
 import { UserConfig } from '../UserConfig';
 import { random } from '../generators';
 import { BusBoyFile, AssFile } from 'ass';
 import { getFileS3, uploadFileS3 } from '../s3';
 import { Readable } from 'stream';
+import * as data from '../data';
 
 const router = Router({ caseSensitive: true });
 
@@ -24,9 +24,6 @@ bb.extend(router, {
 // Render or redirect
 router.get('/', (req, res) => UserConfig.ready ? res.render('index') : res.redirect('/setup'));
 
-// temp file map
-const files = new Map<string, AssFile>();
-
 // Upload flow
 router.post('/', async (req, res) => {
 
@@ -75,11 +72,10 @@ router.post('/', async (req, res) => {
 			assFile.save.s3 = true;
 		}
 
-		log.debug('File saved to', !s3 ? assFile.save.local! : 'S3');
-
-		// todo: save metadata
-		files.set(assFile.fakeid, assFile);
+		// * Save metadata
+		data.put('files', assFile.fakeid, assFile);
 
+		log.debug('File saved to', !s3 ? assFile.save.local! : 'S3');
 		return res.type('json').send({ resource: `${req.ass.host}/${assFile.fakeid}` });
 	} catch (err) {
 		log.error('Failed to upload file', bbFile.filename);