Setting up the Gnus Cloud takes less than a minute. From the Group buffer:
Press ^ to go to the Server buffer. Here you’ll see all the servers that Gnus knows. See Server Buffer.
Then press i to mark any servers as cloud-synchronized (their marks are synchronized).
Then press I to mark a single server as the cloud host (it must
be an IMAP server, and will host a special IMAP folder with all the
synchronization data). This will set the variable
gnus-cloud-method (using the Customize facilities), then ask
you to optionally upload your first CloudSynchronizationDataPack(TM).