FTP File location

i am using RB1100AHx4 router and i try to backup all my client router backups through ftp. that process working properly. but my problem is that when i backup file it will save file RB1100AHx4 router default file path. so i need to save them inside of M2 ssd of the RB1100AHx4 router. how can i set that.

Posted in wrong section.

i can access my required folder through web browser (ftp://192.168.88.1/disk1/). but i need to put file path inside of the script. when i do that script show that address wrong