Comment 4 for bug 1736139

1. I wrote a patch to make that easier
https://github.com/mysql/mysql-server/pull/184

2. That would be a nice, but complex solution.
Also then the warning/failure is during restore instead of during backup.
I like warnings/failures to happen during backup as that's easier to fix.
During restore I'm usually more stressed and under time pressure.

What about a simple solution:
If innodb_log_compressed_pages=OFF when making the backup then print
a warning saying that this is not recommended.