Overcoming the SQL Server Express Edition limitation
From Express Edition:


  SQL Server Express includes 10GB of storage per database


and from Features Supported by the Editions of SQL Server 2014, Cross-Box Scale Limits:


  Maximum relational database size: 10 GB


This latter reference makes it clearer that the 10GB limit per database is applied to relational data, so it excludes log files* as well as FILESTREAM and FileTable data (both supported in Express Edition).



* See Database size limitation in SQL Express by Arvind Shyamsundar