diff --git a/website/client/src/components/group-plans/taskInformation.vue b/website/client/src/components/group-plans/taskInformation.vue
index ef428ce4a9..f58f9396fc 100644
--- a/website/client/src/components/group-plans/taskInformation.vue
+++ b/website/client/src/components/group-plans/taskInformation.vue
@@ -39,7 +39,7 @@
           id="taskMirrorToggle"
           class="mr-3 mb-1 ml-auto"
           :label="'Copy tasks'"
-          :checked="user.preferences.tasks.mirrorGroupTasks"
+          :checked="user.preferences.tasks.mirrorGroupTasks.indexOf(group._id) !== -1"
           :hover-text="'Add assigned and open tasks to your personal task board'"
           @change="changeMirrorPreference"
         />
@@ -431,12 +431,16 @@ export default {
         eventCategory: 'behavior',
         hitType: 'event',
         mirror: newVal,
+        group: this.group._id,
       }, { trackOnClient: true });
-      Analytics.updateUser({
-        mirrorTasks: newVal,
-      });
+      const groupsToMirror = this.user.preferences.tasks.mirrorGroupTasks || [];
+      if (newVal) { // we're turning copy ON for this group
+        groupsToMirror.push(this.group._id);
+      } else { // we're turning copy OFF for this group
+        groupsToMirror.splice(groupsToMirror.indexOf(this.group._id), 1);
+      }
       this.$store.dispatch('user:set', {
-        'preferences.tasks.mirrorGroupTasks': newVal,
+        'preferences.tasks.mirrorGroupTasks': groupsToMirror,
       });
     },
   },
diff --git a/website/server/controllers/api-v3/tasks.js b/website/server/controllers/api-v3/tasks.js
index 09b3e21971..020625de7e 100644
--- a/website/server/controllers/api-v3/tasks.js
+++ b/website/server/controllers/api-v3/tasks.js
@@ -385,7 +385,7 @@ api.getUserTasks = {
   url: '/tasks/user',
   middlewares: [authWithHeaders({
     // Some fields (including _id, preferences) are always loaded (see middlewares/auth)
-    userFieldsToInclude: ['guilds', 'party', 'tasksOrder'],
+    userFieldsToInclude: ['tasksOrder'],
   })],
   async handler (req, res) {
     const types = Tasks.tasksTypes.map(type => `${type}s`);
diff --git a/website/server/libs/tasks/index.js b/website/server/libs/tasks/index.js
index a74303344b..382c9337e6 100644
--- a/website/server/libs/tasks/index.js
+++ b/website/server/libs/tasks/index.js
@@ -165,10 +165,11 @@ async function getTasks (req, res, options = {}) {
   } else if (group) {
     query = { 'group.id': group._id };
   } else {
-    if (user.preferences.tasks.mirrorGroupTasks) {
+    const groupsToMirror = user.preferences.tasks.mirrorGroupTasks;
+    if (groupsToMirror && groupsToMirror.length > 0) {
       upgradedGroups = await Group.find(
         {
-          _id: { $in: user.guilds.concat(user.party._id) },
+          _id: { $in: groupsToMirror },
           'purchased.plan.customerId': { $exists: true },
           $or: [
             { 'purchased.plan.dateTerminated': { $exists: false } },
diff --git a/website/server/libs/user/index.js b/website/server/libs/user/index.js
index f2aa73df69..8e19db0ea8 100644
--- a/website/server/libs/user/index.js
+++ b/website/server/libs/user/index.js
@@ -1,6 +1,7 @@
 import _ from 'lodash';
 import common from '../../../common';
 import * as Tasks from '../../models/task';
+import { model as Groups } from '../../models/group';
 import {
   BadRequest,
   NotAuthorized,
@@ -132,6 +133,34 @@ export async function update (req, res, { isV3 = false }) {
     await checkNewInputForProfanity(user, res, newBlurb);
   }
 
+  if (req.body['preferences.tasks.mirrorGroupTasks'] !== undefined) {
+    const groupsToMirror = req.body['preferences.tasks.mirrorGroupTasks'];
+    if (!Array.isArray(groupsToMirror)) {
+      throw new BadRequest('Groups to copy tasks from must be an array.');
+    }
+    const memberGroups = user.guilds;
+    if (user.party._id) memberGroups.push(user.party._id);
+    for (const targetGroup of groupsToMirror) {
+      if (memberGroups.indexOf(targetGroup) === -1) {
+        throw new BadRequest(`User not a member of group ${targetGroup}.`);
+      }
+    }
+
+    const matchingGroupsCount = await Groups.countDocuments({
+      _id: { $in: groupsToMirror },
+      'purchased.plan.customerId': { $exists: true },
+      $or: [
+        { 'purchased.plan.dateTerminated': { $exists: false } },
+        { 'purchased.plan.dateTerminated': null },
+        { 'purchased.plan.dateTerminated': { $gt: new Date() } },
+      ],
+    }).exec();
+
+    if (matchingGroupsCount !== groupsToMirror.length) {
+      throw new BadRequest('Groups to copy tasks from must have subscriptions.');
+    }
+  }
+
   _.each(req.body, (val, key) => {
     const purchasable = requiresPurchase[key];
 
@@ -140,7 +169,7 @@ export async function update (req, res, { isV3 = false }) {
     }
 
     if (key === 'tags') {
-      if (!Array.isArray(val)) throw new BadRequest('mustBeArray');
+      if (!Array.isArray(val)) throw new BadRequest('Tag list must be an array.');
 
       const removedTagsIds = [];
 
diff --git a/website/server/models/group.js b/website/server/models/group.js
index 80d80ced14..91b1a5ed33 100644
--- a/website/server/models/group.js
+++ b/website/server/models/group.js
@@ -1386,10 +1386,13 @@ schema.methods.leave = async function leaveGroup (user, keep = 'keep-all', keepC
   const promises = user.isModified() ? [user.save()] : [];
 
   // remove the group from the user's groups
+  const userUpdate = { $pull: { 'preferences.tasks.mirrorGroupTasks': group._id } };
   if (group.type === 'guild') {
-    promises.push(User.update({ _id: user._id }, { $pull: { guilds: group._id } }).exec());
+    userUpdate.$pull.guilds = group._id;
+    promises.push(User.update({ _id: user._id }, userUpdate).exec());
   } else {
-    promises.push(User.update({ _id: user._id }, { $set: { party: {} } }).exec());
+    userUpdate.$set = { party: {} };
+    promises.push(User.update({ _id: user._id }, userUpdate).exec());
 
     update.$unset = { [`quest.members.${user._id}`]: 1 };
   }
diff --git a/website/server/models/user/schema.js b/website/server/models/user/schema.js
index 1dd5690978..2af49e89f7 100644
--- a/website/server/models/user/schema.js
+++ b/website/server/models/user/schema.js
@@ -582,7 +582,9 @@ export default new Schema({
     tasks: {
       groupByChallenge: { $type: Boolean, default: false }, // @TODO remove? not used
       confirmScoreNotes: { $type: Boolean, default: false }, // @TODO remove? not used
-      mirrorGroupTasks: { $type: Boolean, default: false },
+      mirrorGroupTasks: [
+        { $type: String, validate: [v => validator.isUUID(v), 'Invalid group UUID.'], ref: 'Group' },
+      ],
     },
     improvementCategories: {
       $type: Array,