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Time Machine disks take ages to scan, and seem way too big

Time Machine uses hard links to represent multiple backups of a directory or file.

Scanning all the backups takes time - it's like scanning the backed up Volumes over and over again.

Although each file only occurs once on the Time Machine volume, Baseline sees each hard link as a separate file, and counts its size again.

Future versions of Baseline will be able to provide much more accurate reports for Time Machine volumes.