For this you need the format EXT4 (Fourth Extended Filesystem):

- It is a file system developed primarily for Linux.

- It offers advanced features such as journaling, support for large volumes of data and files, and optimisation for performance in Linux environments.

- macOS does not have native support to read or write on disks formatted in EXT4. To work with EXT4 on macOS, you would need to install third-party software, such as FUSE for MacOS with the corresponding module.

If you’re working on the MacOS operating system and need to create a backup, it’s advisable to follow these steps:

- You can format it in EXT4, but keep in mind that macOS will not be able to write to it without additional software.

- To format in EXT4:

1. Open the Terminal in macOS.

2. Use tools like `diskutil` to identify the external disk.

3. Install software such as GParted or utilities based on FUSE to format the disk in EXT4.

- However, this process can be complicated and will limit the functionality of the disk on MacOS.

When you succeed, everything works very well on MacOS and Start9.