there's "Samsung Smart Switch", their official backup tool. It sorta works but many settings and apps won't be properly backed up. this is the best you can do officially.

if you're on a slightly older OS version, you may be able to use a recent Linux kernel exploit to temporarily root the device. (see: Root My Galaxy) then you can use a tool like Swift Backup or NeoBackup. (you can't use the official method of unlocking bootloader and doing nandroid backup, because unless you already have an unlocked bootloader, the unlock process mandates factory reset and wipes your data)