Use Multiple Versions of macOS
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The Advantage of Using Multiple Versions of macOS
macOS can set multiple APFS volumes (including bootable APFS volume groups) in one APFS container, which container is equal to partition.
When you set multiple APFS volumes to use both new and old macOS, you can continue to use a stable version of the former macOS, and can also try to use/check a new version of macOS.
Apple Support Official Articles [External Link]
The Points of Installing Multiple Versions of macOS
Operating system can effectively use space of the storage like internal SSD on which macOS is installed by setting multiple APFS volumes in one partition as a whole storage.
For further details to backup APFS volume (group) as a whole, refer to the page "Backup the Whole of macOS" on this website.
Apple Support Official Articles [External Link]
[Reference]
The volume for macOS to be installed can be renamed optionally such as "Sonoma 14" like the right-hand image of this sentence.
However, it is less trouble to be renamed using only alphabets and numbers of one-byte character, not using two-byte characters, uncommon signs, symbols or marks.
The Point on Booting
A Mac can boot from only one macOS at once, and cannot boot with more than one macOS like emulation.
In order to use another version of macOS, you need to reboot a Mac to choose a boot volume on the startup manager.
When you reboot a Mac to start up it in "macOS Recovery" with multiple versions of macOS being installed, your Mac boot from macOS Recovery of macOS set as the startup disk.
Apple Support Official Articles [External Link]
[Reference]
Some third-party application cannot be launched or functioned when it is installed except in the application folder on the boot volume.
In that case, you need to install such applications in the application folder on the boot volume, abiding by its license.
The Advantage of Using Multiple Versions of macOS
macOS can set multiple APFS volumes (including bootable APFS volume groups) in one APFS container, which container is equal to partition.
When you set multiple APFS volumes to use both new and old macOS, you can continue to use a stable version of the former macOS, and can also try to use/check a new version of macOS.
Apple Support Official Articles [External Link]
The Points of Installing Multiple Versions of macOS
Operating system can effectively use space of the storage like internal SSD on which macOS is installed by setting multiple APFS volumes in one partition as a whole storage.
For further details to backup APFS volume (group) as a whole, refer to the page "Backup the Whole of macOS" on this website.
Apple Support Official Articles [External Link]
[Reference]
The volume for macOS to be installed can be renamed optionally such as "Sonoma 14" like the above image.
However, it is less trouble to be renamed using only alphabets and numbers of one-byte character, not using two-byte characters, uncommon signs, symbols or marks.
The Point on Booting
A Mac can boot from only one macOS at once, and cannot boot with more than one macOS like emulation.
In order to use another version of macOS, you need to reboot a Mac to choose a boot volume on the startup manager.
When you reboot a Mac to start up it in "macOS Recovery" with multiple versions of macOS being installed, your Mac boot from macOS Recovery of macOS set as the startup disk.
Apple Support Official Articles [External Link]
[Reference]
Some third-party application cannot be launched or functioned when it is installed except in the application folder on the boot volume.
In that case, you need to install such applications in the application folder on the boot volume, abiding by its license.
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