Daily Back ups.

I just have a quick question to ask about time machine.
Are daily back ups a combination of all the hourly back ups of that day? Or is a daily back up just the files I had on my mac at the beginning of that day.
Just curious,
Steve A Stewart

Once the later backups are deleted for a given day, any file that wasn't on the computer at the time of the first backup of that day, and was gone prior to the first backup of the next day, is no longer in the Time Machine.
If the file was on the machine at the time of the first backup of a given day, and was then edited, and the edited file was still on the machine at least at the point of the first backup of the next day, then two copies of that file (the original and the edited version) are in the Time Machine until the daily backups are deleted to leave only weekly backups.
The way to remember this is that any given backup retained in Time Machine always reflects entirely AND ONLY the state of the file system at that point in time -- without regard to what changes were made to files/folders before or after that point in time.
Thus the deletion of hourly backups (to leave only a daily backup), or the deletion of daily backups (to leave only a weekly backup) can not alter the daily or weekly backup retained in the Time Machine because that wouldn't be a true record of what the file system actually looked like at the time of that retained daily or weekly backup.
--Bob

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