Time Machine deletes "unchanged" files at some point?

I am worried with the fate of old files backed up with Time Machine and that are not changed, like old pictures.
I was told that after the first backup, Time Machine works by making links to unchanged files to avoid copying everything not changed.
_My question_: when Time Machine automatically deletes old backups to make save for the new backups - is it possible that these unchanged files (such a specific old pictures file) be also deleted ? In other words, some of _my old pictures might vanish of Time Machine if its file is not changed_?

Mikus wrote:
I am worried with the fate of old files backed up with Time Machine and that are not changed, like old pictures.
I was told that after the first backup, Time Machine works by making links to unchanged files to avoid copying everything not changed.
Correct.
_My question_: when Time Machine automatically deletes old backups to make save for the new backups - is it possible that these unchanged files (such a specific old pictures file) be also deleted ? In other words, some of _my old pictures might vanish of Time Machine if its file is not changed_?
No. As Malcolm says, Time Machine always has copies of everything currently on your Mac. Every Time Machine backup is, in effect, a full one -- a complete "snapshot" of your entire system.
See How Time Machine works its Magic for an explanation.

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