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Can you try umount of /mnt/backup and check if files are present under that directory after umount ?

I suspect the mount happend after stuff is writen under /mnt/backup directory.

Hope that...

In parallel let me help you to look for the files that fill your / file system.
Your post#11 explains some things. (In your post#1 you said that "df -h" gave output for "/" only. That was...

i suggest you create a directory:

/home/var/lib/mysql

and copy your entire /var/lib/mysql dir to the new directory and then make sure your mysql process can write to the new dir.

Then edit...