Topic: Beware of No Prefix in multi company db
1. If you have more than one company in a single database and
2. for one of them you choose to have no table prefix, then,
3. when backing up that company, all tables in the database (including other companies tables in it) will get backed up and
4. sometimes resulting in a timeout!
This has been documented in the Wiki now and is thanks to lines 506-513 in admin/db/maintenance_db.inc.