Do I need to take database offline to restore?

Can you restore the database while it is offline?

yes,you can restore over-top a DB that is in an offline,WITH REPLACE.

What happens when you take database offline?

Taking the database offline is a quick way to stop the bleeding until you get the bug identified. You can then bring it back online to assess the damage within the database.

How do I get my online database restored?

Here's how you do it:1Stop the service (MSSQLSERVER);2Rename or delete the Database and Log files (C:\Program Files\Microsoft SQL Server\MSSQL. 1\MSSQL\Data...) or wherever you have the files;3Start the service (MSSQLSERVER);4Delete the database with problem;5Restore the database again.SQL Server: Database stuck in "Restoring" state - Stack Overflow

How do I manually restore a database?

Just follow the instructions:1Connect to your SQL Server, right-click on the “Databases” directory, and choose “Restore Database”2Click the button beneath the “Source” section next to “Device”3In the “Select backup device” press “Add”4Select the backup file or files (.bak) you are going to restore, then click “OK”How to Restore SQL Server Database from backup - SQLBackupAndFTP