I tested on a fresh 7.5 VM and it worked without problems.
I created a database, a table and some entries with phpmyadmin, made a backup-data and deleted the database.
After restore-data and restore-config my testdatabase was there again so backup/restore of mariadb102 works.
@giacomo and @davidep we need it for ejabberd, could you please check the source. For example I did a bundle and I create a table to use mariadb102 and phpmyadmin directly.
If you think it valuable we could push it as an official module
Regarding ejabberd, I’d test PostgreSQL and even SQLite before supporting MariaDB 102.
If we decide to add it, it will be the 4th supported database! A little too much for my taste