Just something you will want to be aware of, upgrades from 6.5 to 7.2 are not supported.  You would want to first upgrade from 6.5 to either 7.0 or 7.1 and then wait for the upgrade job to complete before performing the upgrade to 7.2.  Here are some other useful documents: [URL] [URL]  Unfortunately to the best of my knowledge there is no way to backup and restore the local user passwords.
Hi All  I am upgrating OneFS from 6.5.4 to 7.2 I have read the Upgrade Planning and Process Guide already At p.29. It show "Reset the passwords of local accounts after the OneFS upgrade" How can I backup user password and restore after upgrade OneFS 
Backup local user password