I'm new (and green) zibra admin. I am trying to backup zimbra before performing an upgrade. As zimbra user and I am getting Permission denied errors for:

/opt/zimbra/.saveconfig/smtp.crt
/opt/zimbra/.saveconfig/smtp.key
/opt/zimbra/Library

Is this something to be concerned about. Sorry if this is a dumb question but I am nervous about doing this upgrade as I am new to zimbra