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If I have a large file, let's say a 1 GB ISO file, and I add a tag to it through the Finder, so that there's a blue circle next to the filename now, then Time Machine will consider that the file has changed and back it up a second time.

So this one file takes up 2 GB of space on Time Machine now. Is there some way to prevent Time Machine from backing up the entire file if just a tag was added to it?

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    Have you seen evidence that Time Machine actually makes a second copy of a file if only its metadata has changed? I would expect it to just save a delta of the metadata. – Dan J Jun 11 '15 at 18:42
  • Yes I recall this happening. I noticed that it didn't backup the entire file a second time if I put the file inside a folder, and just changed the tags on the folder. – Gary Jun 11 '15 at 19:28

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