I received a warning from Wordfence, a security plug-in, as follows:
This file belongs to plugin "UpdraftPlus - Backup/Restore" version "1.8.5" and has been modified from the file that is distributed by WordPress.org for this version. Please use the link to see how the file has changed.
Plugin Name: UpdraftPlus - Backup/Restore
Plugin URI: http://updraftplus.com
Description: Backup and restore: take backups locally, or backup to Amazon S3, Dropbox, Google Drive, Rackspace, (S)FTP, WebDAV & email, on automatic schedules.
Author: UpdraftPlus.Com, DavidAnderson
I have checked the contents of version 1.8.6 shown by Wordfence and it has many changes. I have no problems, but do not understand why a version that I have not seen in the WordPress updates has somehow become available elsewhere. If you are not the publisher of the version 1.8.6 file, I can post it in pastebin.