How to backup only Application on SEQOUIA. But not backup MACOS.

All new Macs are now shipping with macOS 15.x Sequoia. A Mac cannot use an older OS that existed before the Mac was released, so you cannot install Monterey on a new Mac. The last new Mac with Monterey was released in 2021 to mid-2022.

Plus, you cannot restore a backup from a later version of an OS onto an older OS. Backups can be restored to a later version of macOS, but not the other way around.

Just reinstall your third party apps. If you have a complex custom configuration for a specific app, then just restore that custom configuration file(s).

Time Machine no longer backs up macOS (I can’t remember which version of macOS dropped this functionality but it’s been quite a few years). Yet, your personal applications (not the macOS apps) are backed up in Time Machine (this is a functionality I’ve been using a bit recently).

pirombk2021 wrote:

..... Seqouia because of it make system temperature too hight - 70 degree celcius)

Thanks.

Before going through the painful task of trying to revert back to an older OS, you may want to determine what is actually causing the machine to get hot.

First thing to do when the computer is this warm, open up Activity Monitor and see what processes are using up the most CPU. You can take a screen shot and post the results here for us to take a look at.

Usually what happens is with upgrades that cause excessive CPU use:

-Initially Spotlight can use a lot of CPU and disk access until it completes updating its search data bases. After it completes this and functions normally, the CPU usage and disk access will go down and there by cooling things down

-Also initially after and upgrade, Time Machine will take some time to create a fresh backup, though this usually does not take that long

-Sometimes third party apps may not be completely compatible with some changes with an OS upgrade especially those that launch background processes when the machine boots. Sometimes the incompatibility can cause that 3rd party process to "spin its wheels" and eat up CPU and therefor warm things up.

-3rd party drivers can also suffer the same issue as the above mentioned

So, the first approach is to diagnose the problem and first step would be to get a screen shot of the systems CPU activity so that we can help you figure out the issue.

woodmeister50 wrote:

Note: M1 MacBook Air originally shipped with Big Sur so in theory the OP could install Monterrey.

I think I focused on "new system" & it blinded me to the M1 model. Thanks for catching it.

@woodmeister50 is absolutely correct. In fact, I would suggest running the third party app EtreCheck and posting the complete report here so we can examine it for clues.

How to use the Add Text Feature When Posting an EtreCheck Report - Apple Community

Note: M1 MacBook Air originally shipped with Big Sur so in theory the OP could install Monterrey.