You can take database back-up of SQL server instance using C#, as below
Step 1: Install Nuget package "Install-Package Microsoft.SqlServer.SqlManagementObjects
"
Step 2: Use the below C# Command to take backup using Custom function
public void BackupDatabase(string databaseName, string userName, string password, string serverName, string destinationPath)
{
//Define a Backup object variable.
Backup sqlBackup = new Backup();
//Specify the type of backup, the description, the name, and the database to be backed up.
sqlBackup.Action = BackupActionType.Database;
sqlBackup.BackupSetDescription = "BackUp of:" + databaseName + "on" + DateTime.Now.ToShortDateString();
sqlBackup.BackupSetName = "FullBackUp";
sqlBackup.Database = databaseName;
//Declare a BackupDeviceItem
BackupDeviceItem deviceItem = new BackupDeviceItem(destinationPath + "FullBackUp.bak", DeviceType.File);
//Define Server connection
ServerConnection connection = new ServerConnection(serverName, userName, password); //To Avoid TimeOut Exception
Server sqlServer = new Server(connection);
sqlServer.ConnectionContext.StatementTimeout = 60 * 60;
Database db = sqlServer.Databases[databaseName];
(Reference Database As microsoft.sqlserver.management.smo.database, not as System.entity.database)
sqlBackup.Initialize = true;
sqlBackup.Checksum = true;
sqlBackup.ContinueAfterError = true;
//Add the device to the Backup object.
sqlBackup.Devices.Add(deviceItem);
//Set the Incremental property to False to specify that this is a full database backup.
sqlBackup.Incremental = false;
sqlBackup.ExpirationDate = DateTime.Now.AddDays(3);
//Specify that the log must be truncated after the backup is complete.
sqlBackup.LogTruncation = BackupTruncateLogType.Truncate;
sqlBackup.FormatMedia = false;
//Run SqlBackup to perform the full database backup on the instance of SQL Server.
sqlBackup.SqlBackup(sqlServer);
//Remove the backup device from the Backup object.
sqlBackup.Devices.Remove(deviceItem);
}
Add References
Microsoft.SqlServer.ConnectionInfo
Microsoft.SqlServer.Management.Sdk.Sfc
Microsoft.SqlServer.Smo
Microsoft.SqlServer.SmoExtended
Microsoft.SqlServer.SqlEnum
That's it, you are done, it will take backup of specified database at specified location passed to the function.
Source: Various ways to back up SQL server database
Note: User must have proper rights to write backup data on specified disk location.