MySQL radacct backup

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Hello everybody,
I've a full working freeradius server on an Ubuntu server.

My accounting table grows and grows so I'd like to backup my data in
any way; before I write my own procedure, does the server (freeradius)
provide any utility?
I've looked in the config but I've not found anything useful.

Basically, this would be something different from a simple MySQL
Database backup as I'll have to keep info about the total
AcctSessionTime of every user.

Thanks!
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