When the Time Machine drive is full and deletes the oldest stuff to make room, does it take into consideration whether you have only one backup of a file?
Time Machine’s oldest backup is on 1/1/2021, and on that date it backed up files A, B, and C.
As time goes on, only file A is edited, the latest edit occurring yesterday. So now the latest backup of file A is from yesterday, but the latest and only backup of files B and C are from 1/1/2021. When Time Machine goes to perform its next backup, it sees the drive doesn’t have enough space, so it has to make space. Does it delete files A, B, and C from 1/1/2021? Or does it just delete file A from 1/1/2021?
I’m trying to determine whether Time Machine is suited for long-term, archival, or permanent backups. If not, please let me know if there is a method that is better suited for “forever” backups, and how that is done and maintained.