preupg.log.INFO: The /etc/crypttab backup file is not tracked by any package but it is a part of the input list. preupg.log.INFO: The /etc/selinux/targeted/modules/active/seusers.final backup file is not tracked by any package but it is a part of the input list. preupg.log.INFO: The /etc/selinux/targeted/modules/active/users_extra backup file is not tracked by any package but it is a part of the input list. preupg.risk.SLIGHT: We detected some files where their modifications are not tracked by the RPM packages. Check the functionality of the files after the successful upgrade. preupg.risk.HIGH: The /etc/shadow and /etc/gshadow files must be backed up manually by the administrator.

根据Preupgrade Assistant生成的日志信息，有三个文件没有被任何软件包跟踪，但是它们是升级输入列表的一部分。这些文件是/etc/crypttab备份文件、/etc/selinux/targeted/modules/active/seusers.final备份文件和/etc/selinux/targeted/modules/active/users_extra备份文件。

Preupgrade Assistant还提示，一些文件的修改没有被RPM软件包跟踪，需要在升级后检查它们的功能是否正常。这属于SLIGHT级别的风险，但需要注意。

此外，Preupgrade Assistant还提示，/etc/shadow和/etc/gshadow文件必须由管理员手动备份。这被认为是HIGH级别的风险，因为这些文件包含用户的密码信息。

因此，在升级之前，您应该手动备份/etc/shadow和/etc/gshadow文件，并确保没有丢失任何重要的数据。此外，您还应该检查其他文件的功能是否正常，以确保升级后系统的稳定性和安全性。