We want to upgrade the version from 4.2.11 to 4.2.21  for "SSO for Atlassian Server and Data Center" plugin in our JSM datacenter instance(Jira Service Management 4.20.21 with Jira Core as 8.20.21),
want to confirm is it possible to roll back to 4.2.11 if we get any issue after upgrade to 4.2.21 ? and do we need to backup the files? and will our data and configuration be lost after roll back? and is there anything we need to take care when upgrade to 4.2.21