Please be aware that some post content could (and will be lost ) while I'm working on the upgrade.
I do a Backup but can miss up to 24 hours of content.
Only thing I track to manually replace if needed are any Store purchases, New membership, Renewals and event registrations.
If possible, when creating a new post, copy paste the text and save in it a word document. That way if your content didn't make the backup, you can just COPY/PASTE it once I'm 100% done.
Thanks