During the upgrade process, Lifecycle Management takes the following backups:
PSC VM snapshot
vCenter VM snapshot
ESXi configuration backup.
Backup directory on SDDC Manager Utility VM is /backup/lcm/ESX. Backup for each ESXi host is stored in its guid (stored in database). Each backup is in a date sub folder. An example ESXi backup file name is /backup/lcm/ESX/f32b407e-8fdb-4999-ab80-2082003586fb/02022017014114/backup/firmwareConfig865759412960483871.tgz.
NSX configuration backup.
Backup directory on SDDC Manager Utility VM is /backup. File names have the prefix evo-nsx-domain_id_date. An example NSX backup file name is /backup/evo-nsx-888bcb7f-30d0-3aee-9291-b7777052a1ac-01_00_00_Tue07Feb2017.
To access the backup directory, login to the SDDC Manager Utility VM as root. See Look Up Account Credentials Using the Lookup-Password Command.
For best practice information, refer to the documentation for individual VMware products.
Upgrading Cloud Foundation is a multi step process. You must follow each step in the order in which it is documented.