Hi there,
To back up what a.p. has said - yes you can remove the "export" folder. This will have been from one of the upgrades previously done.
If you don't have a virtual vCenter (close your ears other VMware admins at this point as shock horror as we don't) then you could also simply move the folder to another drive/system until you are happy with the advice and that things haven't imploded.
Another thing you might not be aware of is this: https://blogs.technet.microsoft.com/askpfeplat/2014/05/13/how-to-clean-up-the-winsxs-directory-and-free-up-disk-space-on…
Not sure what OS you are running on your vCenter on but if its Windows 2008 R2 then you might be able to recover space from the WinSXS folder by using this tool.
Kind regards.