ref : from
https://solutioncenter.apexsql.com/create-daily-database-backups-with-unique-names-in-sql-server/
--Script 1: Backup specific database
-- 1. Variable declaration
DECLARE @path VARCHAR(500)
DECLARE @name VARCHAR(500)
DECLARE @pathwithname VARCHAR(500)
DECLARE @time DATETIME
DECLARE @year VARCHAR(4)
DECLARE @month VARCHAR(2)
DECLARE @day VARCHAR(2)
DECLARE @hour VARCHAR(2)
DECLARE @minute VARCHAR(2)
DECLARE @second VARCHAR(2)
-- 2. Setting the backup path
SET @path = 'C:\sTargetFolder\'
-- 3. Getting the time values
SELECT @time = GETDATE()
SELECT @year = (SELECT CONVERT(VARCHAR(4), DATEPART(yy, @time)))
SELECT @month = (SELECT CONVERT(VARCHAR(2), FORMAT(DATEPART(mm,@time),'00')))
SELECT @day = (SELECT CONVERT(VARCHAR(2), FORMAT(DATEPART(dd,@time),'00')))
SELECT @hour = (SELECT CONVERT(VARCHAR(2), FORMAT(DATEPART(hh,@time),'00')))
SELECT @minute = (SELECT CONVERT(VARCHAR(2), FORMAT(DATEPART(mi,@time),'00')))
SELECT @second = (SELECT CONVERT(VARCHAR(2), FORMAT(DATEPART(ss,@time),'00')))
-- 4. Defining the filename format
SELECT @name ='sPrefixDBName' + '_' + @year + @month + @day + @hour + @minute + @second
SET @pathwithname = @path + @namE + '.bak'
--5. Executing the backup command
BACKUP DATABASE [sDBName]
TO DISK = @pathwithname WITH NOFORMAT, NOINIT, SKIP, REWIND, NOUNLOAD, STATS = 10
