We recommend you to read the following and apply the solutions you consider suitable:

Additional readings about backups

•http://technet.microsoft.com/en-us/library/ms190202(v=sql.110).aspx

Additional readings about SQL maintenance

•http://dba.stackexchange.com/questions/2687/sql-server-maintenance-plan-best-practices-on-tasks-and-scheduling

•Maintenance plans for SQL Server 2014: http://msdn.microsoft.com/en-us/library/ms187658.aspx

•Best Practice recommendations for SQL Server Database Backups: http://support.microsoft.com/kb/2027537

•SQL Server Maintenance Plan Best Practices: http://justgeeks.blogspot.it/2012/07/sql-server-maintenance-plan-best.html