diff --git a/src/components/user/User.tsx b/src/components/user/User.tsx
index 4a92a8f..9796d55 100644
--- a/src/components/user/User.tsx
+++ b/src/components/user/User.tsx
@@ -19,6 +19,8 @@ import { isFunction } from 'lodash';
 import { userId } from '~/lib/user-id';
 import { userExists } from '~/lib/user-exists';
 import { update } from '~/lib/update';
+import { replicationDocument } from '~/lib/replication-document';
+import { get } from '~/lib/get';
 
 interface Props {
   values?: () => any;
@@ -114,6 +116,10 @@ const User: Component<Props> = (props) => {
       database,
     };
 
+    const currentUserId = userId(data('username'), data('database'));
+    const credentials = adminCredentials();
+    const adminUser = credentials?.username || '';
+
     for (let i = 0; i < updatedSubscriptions.length; i++) {
       let subscription = updatedSubscriptions[i];
       if (!isIn(subscription.username, previousSubscriptions())) {
@@ -122,6 +128,24 @@ const User: Component<Props> = (props) => {
           addSubscriptionFactory(subscription.username),
           defaultUserDocument
         );
+        const otherUserId = userId(subscription.username, data('database'));
+        const otherUserPassword = (await get(otherUserId)).password;
+        let repDocument = replicationDocument(
+          currentUserId,
+          data('password'),
+          otherUserId,
+          otherUserPassword,
+          adminUser
+        );
+        await put(repDocument._id, repDocument, false, '_replicator');
+        repDocument = replicationDocument(
+          otherUserId,
+          otherUserPassword,
+          currentUserId,
+          data('password'),
+          adminUser
+        );
+        await put(repDocument._id, repDocument, false, '_replicator');
         console.log({
           caller: 'User / submitHandler / new subscription',
           username: subscription.username,
@@ -139,6 +163,7 @@ const User: Component<Props> = (props) => {
           removeSubscriptionFactory(subscription.username),
           defaultUserDocument
         );
+
         console.log({
           caller: 'User / submitHandler / deleted subscription',
           username: subscription.username,
@@ -269,7 +294,7 @@ const User: Component<Props> = (props) => {
         <Progress.Root
           value={progress()}
           minValue={0}
-          maxValue={10}
+          maxValue={3}
           getValueLabel={({ value, max }) =>
             `${value} of ${max} tasks completed`
           }
diff --git a/src/lib/get-db-url-for-user.ts b/src/lib/get-db-url-for-user.ts
new file mode 100644
index 0000000..21d3e64
--- /dev/null
+++ b/src/lib/get-db-url-for-user.ts
@@ -0,0 +1,4 @@
+import { toHex } from './to-hex';
+
+export const getDbUrlForUser = (user: { username: string; hostname: string }) =>
+  `https://${user.hostname}/userdb-${toHex(user.username)}`;
diff --git a/src/lib/replication-document.ts b/src/lib/replication-document.ts
new file mode 100644
index 0000000..0bec43d
--- /dev/null
+++ b/src/lib/replication-document.ts
@@ -0,0 +1,51 @@
+import { parseUserId } from './user-id';
+import { getDbUrlForUser } from './get-db-url-for-user';
+
+export const replicationDocument = (
+  userFromId: string,
+  userFromPassword: string,
+  userToId: string,
+  userToPassword: string,
+  adminUser: string
+) => {
+  const userFrom = parseUserId(userFromId);
+  const userTo = parseUserId(userToId);
+
+  const document = {
+    _id: `${userFromId}=>${userToId}`,
+    user_ctx: {
+      name: adminUser,
+      roles: ['_admin', '_reader', '_writer'],
+    },
+    source: {
+      url: getDbUrlForUser(userFrom),
+      auth: {
+        basic: {
+          username: userFrom.username,
+          password: userFromPassword,
+        },
+      },
+    },
+    target: {
+      url: getDbUrlForUser(userTo),
+      auth: {
+        basic: {
+          username: userTo.username,
+          password: userToPassword,
+        },
+      },
+    },
+    selector: {
+      to: {
+        $elemMatch: {
+          $eq: userToId,
+        },
+      },
+    },
+    create_target: false,
+    continuous: true,
+    owner: adminUser,
+  };
+
+  return document;
+};
diff --git a/src/lib/update.ts b/src/lib/update.ts
new file mode 100644
index 0000000..140ce4c
--- /dev/null
+++ b/src/lib/update.ts
@@ -0,0 +1,24 @@
+import { get } from './get';
+import { put } from './put';
+
+export const update = async (
+  id: string,
+  updater: (doc: any) => any,
+  defaultDocument: any,
+  db = 'dyomedea_users'
+) => {
+  const previous = await get(id, db);
+
+  const newDocument = updater(previous || defaultDocument);
+
+  console.log({
+    caller: 'update',
+    id,
+    defaultDocument,
+    db,
+    previous,
+    newDocument,
+  });
+
+  return await put(id, newDocument, false, db);
+};
diff --git a/src/lib/user-exists.ts b/src/lib/user-exists.ts
new file mode 100644
index 0000000..8bc948a
--- /dev/null
+++ b/src/lib/user-exists.ts
@@ -0,0 +1,30 @@
+import { adminCredentials } from '~/components/credentials';
+import { headersWithAuth } from './headers-with-auth';
+
+export const userExists = async (username: string) => {
+  const credentials = adminCredentials();
+  if (!credentials) {
+    return null;
+  }
+  const { database } = credentials;
+
+  const headers = headersWithAuth();
+  if (!headers) {
+    return null;
+  }
+
+  try {
+    const response = await fetch(
+      `${database}/_users/org.couchdb.user:${username}`,
+      {
+        method: 'HEAD',
+        mode: 'cors',
+        headers,
+      }
+    );
+    return response.status === 200;
+  } catch (error) {
+    console.error({ caller: 'userExists', error });
+    return null;
+  }
+};