I installed Updraft Plus (free version) yesterday on my WPMS to test it out. All seemed to go well and I conected Google Drive to make my first back up. My site is privately hosted at http://www.firouzeh.co.uk (i.e. not wordpress.com where this issue usually occurs)
I tried to access my site again today and was shown the error "This site has been archived or suspended." I have checked my database and can confirm that the site was not accidentally archived (wp_blogs archived = 0). I have also contacted my server and can confirm they have not suspended my account.
Occasionally this issue occurs with people who have hosted their sites on wordpress.com - which is not my case, however there seems to be a bug that is throwing up a same error.
Would appreciate any insight you have into a fix as the backup system seems perfect. For the meantime I am restoring to a version from August which is a bit out of date.
All the best