Sql 2008 express into cluster

SQL Server Express 2008 supports database backups. It's missing SQL Agent, which allows to schedule backups, and the maintenance plan wizard for creating a backup tasks.

You can backup databases in two different ways:

1. Use Microsoft SQL Server Management Studio Express which has the Backup option on the right click menu for each database under "tasks."
2. Use T-SQL to manually write your backup script. Read the MSDN documentation for the T-SQL BACKUP command.
   Syntax something like: BACKUP DATABASE MyDatabase TO DISK='C:\MyDatabase.bak';

If you want to schedule your backup jobs, you have to write a T-SQL script and then use the Windows Task Schedule to call SQLCmd to run the script on what every schedule you're interested in:

 sqlcmd -s server_name\sqlexpress -i C:\SqlJobs\backup.sql -o C:\Logs\output.txt

Most likely, yes. Have a look here for a comparison of the SQL Server 2008 editions:

http://www.microsoft.com/sqlserver/2008/en/us/editions-compare.aspx