diff --git a/migrations/challenges/sync-all-challenges.js b/migrations/challenges/sync-all-challenges.js
new file mode 100644
index 0000000000..5200bab806
--- /dev/null
+++ b/migrations/challenges/sync-all-challenges.js
@@ -0,0 +1,47 @@
+import Bluebird from 'Bluebird';
+
+import { model as Challenges } from '../../website/server/models/challenge';
+import { model as User } from '../../website/server/models/user';
+
+async function syncChallengeToMembers (challenges) {
+  let challengSyncPromises = challenges.map(async function (challenge) {
+    let users = await User.find({
+      // _id: '',
+      challenges: challenge._id,
+    }).exec();
+
+    let promises = [];
+    users.forEach(function (user) {
+      promises.push(challenge.syncToUser(user));
+      promises.push(challenge.save());
+      promises.push(user.save());
+    });
+
+    return Bluebird.all(promises);
+  });
+
+  return await Bluebird.all(challengSyncPromises);
+}
+
+async function syncChallenges (lastChallengeDate) {
+  let query = {
+    // _id: '',
+  };
+
+  if (lastChallengeDate) {
+    query.createdOn = { $lte: lastChallengeDate };
+  }
+
+  let challengesFound = await Challenges.find(query)
+    .limit(10)
+    .sort('-createdAt')
+    .exec();
+
+  let syncedChallenges = await syncChallengeToMembers(challengesFound)
+    .catch(reason => console.error(reason));
+  let lastChallenge = challengesFound[challengesFound.length - 1];
+  if (lastChallenge) syncChallenges(lastChallenge.createdAt);
+  return syncedChallenges;
+};
+
+module.exports = syncChallenges;
diff --git a/migrations/migration-runner.js b/migrations/migration-runner.js
index 33b6d35279..f767f60105 100644
--- a/migrations/migration-runner.js
+++ b/migrations/migration-runner.js
@@ -1,24 +1,25 @@
-require("babel-register");
-require("babel-polyfill");
-
-// This file must use ES5, everything required can be in ES6
-
-function setUpServer () {
-  var nconf = require('nconf');
-  var mongoose = require('mongoose');
-  var Bluebird = require('bluebird');
-  var setupNconf = require('../website/server/libs/setupNconf');
-  setupNconf();
-  // We require src/server and npt src/index because
-  // 1. nconf is already setup
-  // 2. we don't need clustering
-  require('../website/server/server'); // eslint-disable-line global-require
-}
-setUpServer();
-
-// Replace this with your migration
-var processUsers = require('./groups/update-groups-with-group-plans');
-processUsers()
-  .catch(function (err) {
-      console.log(err)
-  })
+require("babel-register");
+require("babel-polyfill");
+
+// This file must use ES5, everything required can be in ES6
+
+function setUpServer () {
+  var nconf = require('nconf');
+  var mongoose = require('mongoose');
+  var Bluebird = require('bluebird');
+  var setupNconf = require('../website/server/libs/setupNconf');
+  setupNconf();
+  // We require src/server and npt src/index because
+  // 1. nconf is already setup
+  // 2. we don't need clustering
+  require('../website/server/server'); // eslint-disable-line global-require
+}
+setUpServer();
+
+// Replace this with your migration
+var processUsers = require('./groups/update-groups-with-group-plans');
+processUsers()
+  .catch(function (err) {
+      console.log(err)
+  })
+
diff --git a/test/api/v3/unit/models/challenge.test.js b/test/api/v3/unit/models/challenge.test.js
index bbde1064a7..49f0ce9283 100644
--- a/test/api/v3/unit/models/challenge.test.js
+++ b/test/api/v3/unit/models/challenge.test.js
@@ -104,6 +104,40 @@ describe('Challenge Model', () => {
         expect(updatedNewMember.tags[7].id).to.equal(challenge._id);
         expect(updatedNewMember.tags[7].name).to.equal(challenge.shortName);
         expect(syncedTask).to.exist;
+        expect(syncedTask.attribute).to.eql('str');
+      });
+
+      it('syncs a challenge to a user with the existing task', async () => {
+        await challenge.addTasks([task]);
+
+        let updatedLeader = await User.findOne({_id: leader._id});
+        let updatedLeadersTasks = await Tasks.Task.find({_id: { $in: updatedLeader.tasksOrder[`${taskType}s`]}});
+        let syncedTask = find(updatedLeadersTasks, function findNewTask (updatedLeadersTask) {
+          return updatedLeadersTask.challenge.taskId === task._id;
+        });
+
+        let createdAtBefore = syncedTask.createdAt;
+        let attributeBefore = syncedTask.attribute;
+
+        let newTitle = 'newName';
+        task.text = newTitle;
+        task.attribute = 'int';
+        await task.save();
+        await challenge.syncToUser(leader);
+
+        updatedLeader = await User.findOne({_id: leader._id});
+        updatedLeadersTasks = await Tasks.Task.find({_id: { $in: updatedLeader.tasksOrder[`${taskType}s`]}});
+
+        syncedTask = find(updatedLeadersTasks, function findNewTask (updatedLeadersTask) {
+          return updatedLeadersTask.challenge.taskId === task._id;
+        });
+
+        let createdAtAfter = syncedTask.createdAt;
+        let attributeAfter = syncedTask.attribute;
+
+        expect(createdAtBefore).to.eql(createdAtAfter);
+        expect(attributeBefore).to.eql(attributeAfter);
+        expect(syncedTask.text).to.eql(newTitle);
       });
 
       it('updates tasks to challenge and challenge members', async () => {
diff --git a/website/server/libs/taskManager.js b/website/server/libs/taskManager.js
index 2a47207384..163dbc452c 100644
--- a/website/server/libs/taskManager.js
+++ b/website/server/libs/taskManager.js
@@ -184,7 +184,7 @@ export async function getTasks (req, res, options = {}) {
 export function syncableAttrs (task) {
   let t = task.toObject(); // lodash doesn't seem to like _.omit on Document
   // only sync/compare important attrs
-  let omitAttrs = ['_id', 'userId', 'challenge', 'history', 'tags', 'completed', 'streak', 'notes', 'updatedAt', 'group', 'checklist'];
+  let omitAttrs = ['_id', 'userId', 'challenge', 'history', 'tags', 'completed', 'streak', 'notes', 'updatedAt', 'createdAt', 'group', 'checklist', 'attribute'];
   if (t.type !== 'reward') omitAttrs.push('value');
   return _.omit(t, omitAttrs);
 }