Recently I learned that you can and probably should increase the number of SQL Server Error logs that your instance of SQL Server maintains. This is real simple to change. You can make the change via the GUI with a few simple steps or accomplish it with TSQL.
To make this change with SSMS, open SSMS, connect to your instance, expand Management, right click on SQL Server Logs and chose Configure. You can then check the box “Limit the number of error log files before they are recycled” and increase the number from 6 to any number up to 99.
Using TSQL you can execute the following statement to increase to 99 files, simply change 99 to how ever many files you would like to retain.
EXEC xp_instance_regwriteN’HKEY_LOCAL_MACHINE’,N’Software\Microsoft\MSSQLServer\MSSQLServer’,N’NumErrorLogs’, REG_DWORD, 99;