Hi,
After a lot of time, the problem was solved
> Adding this variable in the MA:
OB2IPCNOSENDRECVLOOP=1
OB2SHMIPC=1
> Adding this Windows configuration in all Windows Servers:
netsh interface tcp set global autotuninglevel=disabled
> Change the configuration of drives:
Disk Agent Buffer Size: 16 to 8
Block Size: 64 to 256
After all this, the backup with mirror down from 7 hours to 4 hours.