Xbox one to series x savefile transfer

It's all tied to your account. So you can redownload the game for free on the new console and your save is stored on the cloud as long as you're signed in and will sync up when you play.

Not really...

Xbox Series X games / upgrades / updates has to be installed onto the Series X internal or expansion card SSD,

You can have Xbox One games on your external hard drive that will get an Series X upgrade but the games will need to be transferred to the Series X and then the Series X upgrade will need to be downloaded onto the Series X SSD,

As an example...

I have Marvel Avengers on my external hard drive that will get the Series X upgrade and I will transfer the game over to the Series X SSD ready to download and update the game to the Series X version when available.

The data transfer cable is used to transfer the entire content of a harddrive from one HDD to another for the Xbox360

DLC, games and savefiles will just be available for download but will not be transferable through the transfercable. Savegames need to be saved to the cloud on the Xbox 360 before they are made available on the Xbox One the other content will just be available
as a marketplace download or from the ready to install list

On Xbox 360 console license transfer is possible but on Xbox One or Xbox Series X|S that is not an option.

Thank you!

Depends .

If it is a disk game and you are trying to transfer to an xbox one s digital or the xbox series s then no you are waisting your time

Those are digital only consoles and disks installs require the bluesy or dvd to validate the install

Digitally purchased game's can be transfered to save time yes

If it's to an xbox one x or regular xbox one s or xbox series x disk and digital will work with them