Ok so it worked correctly today, for you. How do we know it will continue to do so five years down the road when they are suffocating for cash? The more stuff we have there, the harder it becomes to verify their takeout will have everything.
When proven wrong, hackers always say "Well in 5 years time or in 10 years time, things might have changed, so I was right and you were wrong".
It limits your own reasoning capabilities, and your satisfaction of always being right yet again will start diminishing with time.
- if it is worth backup up or exporting, it is worth doing it early and often
- but more importantly if we backing up and exporting, we should be continuously thinking are we even on the right platform? Does a better alternative exist?
How bad it is if put of 200+ conversations, a couple of those are not exported correctly? Not much honestly. If I verify some of those and they are ok, I would see no reason to keep verifying all of them.