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According to Apple Support, there is no local snapshot saved beyond 24 hours:

Time Machine saves one snapshot of your startup disk approximately every hour, and keeps it for 24 hours. It keeps an additional snapshot of your last successful Time Machine backup until space is needed. And in macOS High Sierra or later, another snapshot is saved before installing any macOS update.

Is there a way to overcome this limit? Given the disk space is more than enough (60% free out of 500GB).

A possible workaround is to run tmutil localsnapshot manually.

Update 09-22: tmutil localsnapshot created snapshot also adhere to the above rule.

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  • Maybe don't use Time Machine for this? You might be able to roll your own solution using rsync ss64.com/osx/rsync.html; There might be new problems calling time machine as often as you need? Sep 20, 2021 at 8:07
  • Rsync takes up much more space ot only keeps one version. Look at apfs snapshots which carbon copy clone provides an easy to use way
    – mmmmmm
    Sep 20, 2021 at 10:52
  • @user1787331 thanks, I do use Arq, but the time machine local snapshot has its advantage like speedy and smaller overhead.
    – georgexsh
    Sep 21, 2021 at 17:28
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    @georgexsh I asked a very similar but slightly different question. You may check it out
    – porg
    Sep 30, 2021 at 18:29

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