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And: When the servers have core licenses, then you need no CAL's.
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Hello,<br />
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What is the SQL Server version edition and server licence. anyway it is compliance and you can schedule backups to your backup device from maintenance plan.
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I have three backup end SQL server srv1,srv2 and srv3. Do I need three CAL to &nbsp;a user to connect to all servers or I will be ok with one device license?
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I have three backup end SQL server srv1,srv2 and srv3. Do I need three CAL to  a user to connect to all servers or I will be ok with one device license?

sql license

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.