The clean install would just be to get a correct config.inc.php for your new host. You can copy settings like path/database etc from that config.inc.php to your old config.inc.php.
That new clean install would be thrown away.
The database is located on the mysql server, it's not a file download, you actually need to backup.
If you have to transfer for tomorrow night, my best suggestion would be to close the board asap, and use database tools > backup to get a backup of your database. After that's done (which can take a while, but not too long since your board is relatively small), just download each and everyfile you have at your current host
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