Hey there and welcome to the Samsung UK and EU Community Customer to Customer Forum
It is recommended by many on here to not use SmartSwitch to update apps on a new device. This is because apps have many different variants so it is best to get the new one from the Play Store for your new device.
In terms of backing up your images, documents, files, music, texts and call logs etc, I would recommend you use Google as then you can back up almost daily whilst your device is charging (usually overnight) and not lose anything.
Google give 15gb free, 100gb costs about £16 a year and 200gb about £25 a year.
S24 Ultra