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I think backing up a database on a single machine is quite simple, since the database is in control of the transactional consistency.
The problem is that MMO games like Wish have hundreds of servers running, each with its own database, which means that a mechanism of ensuring that the backups are consistent amongst servers is also required.
It depends on the game/application as well. For some, it might be "OK" for the backups to be initiated a few seconds apart. For others, this could mean absolute chaos.
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