Windows_components >SqlServerWriter database backup size

Hello,

I am using windows_components >SqlServerWriter to backup my SQL database, after backup complete I am looking into server backups windows_components >SqlServerWriter on desired database backup, I can see its taken only a few bytes/Kbytes space on backup, while on reality database itself takes few hundreds or few gigs on disk.
any reason it’s like that did I missed something?
Please advice
Thanks

Only thing i can imagine is a lot of free space inside the database.
There s something like disk space suage report inside mssql that you cn run to check this.