I also have a client website with 100+ pages (but less than the 400 recommended limit). Several people are allowed to log in and make content changes, so there are multiple opportunities every day for something to go catastrophically wrong. (We lost a legacy gallery block with 150+ images just the other day, after having carefully preserved it during the switch from 7.0 to 7.1!)
I know we can't backup the site via built-in "Duplicate site." I read the guide you linked to in your earlier response, but it looks like you didn't have suggestions for sites over 100 pages?
Surely there's something we can do via a plug-in or a third-party service. An xls file it better than nothing, but just barely, because the content is spread across so many different blocks & sections that copying/pasting will take a looooooong time.
I'm stressed because no backups + no roll-back function = a hot mess for this client & many volunteer org's, where whoever's available comes in and makes changes.
Any help appreciated, thanks!