We currently close the game servers twice a week on Tuesdays and Fridays in order to carry out maintenance.

These maintenances are usually done between 8.30am and 10.30am (GMT), but in some circumstances may continue beyond 10.30am.

These maintenances enable us to complete the following tasks:

Recovery and repartition of the different log files.
Maintenance of our database: optimization of certain tables which can only be done when they are shut down and not being used by players.
Maintenance of the game servers: rebooting game servers enables us to prevent in-game lag problems, which tend to become quite considerable if servers aren’t rebooted regularly.
Complete backup of the game servers’ data: we’ve recently set up a new backup system for all the game data when servers are running, without interrupting the game, but we’ve also decided to keep doing the backups when game servers are shut down while we test our new backup system.
Update of the server: the programs for server and game data are sometimes updated and replaced by a more recent version.
These maintenances are usually done between 8.30am and 10.30am (GMT) in order to minimize the inconvenience to players.

These maintenances are extremely important for us to ensure the proper functioning of our game servers. Even if maintenances do not bring modifications or bug corrections, they always play an important part in maximizing the performance of our databases and servers.

We are aware that interrupting our game servers is unpleasant for you players. That’s why we try to reduce the duration of interruptions as much as we can, and to improve our maintenance processes which, for now, reduce their duration, and in the future might reduce their frequency.

from :http://forum.dofus.co.uk/