I have a 1.25TB partition that I use for Time Machine backups. When I am in the system preferences for Time Machine on my Mac, it states there's 525GB of 1.25TB available. But when I browse to the partition, there's only two sparse disk image bundles present (one for my wife's laptop and one for mine), and the total size between the two of them is only 83GB. So why does Time Machine think there's already almost 750GB of disk space already being used? Does the Time Machine partition reserve space for future use and adjust the report of available disk space accordingly?
Here's the (relevant) output from
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on ... //foobar@Extreme._afpovertcp._tcp.local/TIMACHINE 1.1Ti 764Gi 401Gi 66% 200229312 105076638 66% /Volumes/TIMACHINE-1