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After Time Machine is running for a year or so, I exclude some folders like ~/Downloads with the hope to save some disk space on the Time Machine external drive.

  • Will the old files (such as those in ~/Downloads) still kept in TM backup?
  • Will disk space be saved on the Time machine external drive?
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Old copies stay on the Time Machine backup drive until such time as the date-time for a particular 'snapshot' gets rolled off the drive (deleted) due to TM making space for new backups as the TM drive fills up.

Excluding a folder simply stops it being backed up in future runs.

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