Code:
DECLARE @path VARCHAR(256)
SET @path = 'E:\SQLBACKUPS\'
EXECUTE master.dbo.xp_create_subdir @path
DECLARE @query nvarchar(max);

DECLARE @name VARCHAR(50) -- database name
DECLARE @fileName VARCHAR(256) -- filename for backup

DECLARE db_cursor CURSOR FOR
SELECT name
FROM master.dbo.sysdatabases
WHERE name NOT IN ('master','model','msdb','tempdb') -- exclude these databases

OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @name

WHILE @@FETCH_STATUS = 0
BEGIN
SET @fileName = @path + @name + '.BAK'
BACKUP DATABASE @name TO DISK = @fileName
FETCH NEXT FROM db_cursor INTO @name
END

CLOSE db_cursor
DEALLOCATE db_cursor

IF EXISTS
(
SELECT name FROM master.dbo.sysdatabases
WHERE name = N'SSISDB'
)
BEGIN


USE SSISDB

DECLARE @command NVARCHAR(MAX)
SET @command = 'BACKUP MASTER KEY TO FILE = ''' + @path + N'SSISDB_MASTERKEY'' '
+ 'ENCRYPTION BY PASSWORD = ''Password1$'';'
exec sp_executesql @command


END
ELSE
BEGIN
print 'SSISDB DOES NOT EXIST - COULD NOT BACKUP MASTER KEY'
END
​