You will need to open the appliance management page at https://yourvcenterserver:5480 and you will see the login page that will require not your SSO account, but the root vCenter username and password that you setup during your vCenter install.
select the items that you want to backup, the only other option besides the base backup is the Stats, Alarms, and Events information and then give a description if you like.
Here you can see vcenter backup running to my FTP server, its currently uploading files to the directory I have chosen.
It all works really well and the backup took no time at all over a 1Gb link.
Now let's take a look at how the restore functionality works. First you need to mount and open the VCSA iso and click restore
Then you will need to specify the location and credentials of your ftp backup server and backup location for restoring all of the data.
From here on out things will look very familiar as its the same as a new installation. Thanks for reading!