As I understand it Time Machine will create the folder structure and create a copy of all of the files that are to be included in the Time Machine backup during the first backup. After that a hard link is created during every subsequent backup for files that have not been changed.
The question that I have is how files that have been changed since the last backup are backed up in the subsequent backup. I thought that it copied the entire modified file to the TM backup, but it appears that that isn't how TM works and I was hoping for some clarification.
During a recent practice test that I took for ACSP 10.12 it asked if, for a 5MB file if it was modified such that the new version was 6MB, would the TM have a separate 5MB and 6MB file or would it backup the 1MB difference between the two files and just retain the 1MB addition in the most recent TM backup. I figured that, though it may take up additional space to have a separate copy of the 5MB version and the 6MB version, it would provide a safety net in the event that an early version were deleted or corrupted - effectively ruining every subsequent version of that file. But the practice test said that it just saves the 1MB difference.
I was just looking for some clarification to help improve my understanding. Thanks in advance for any help!