bdphourde wrote:
I don't need a full backup. I'm looking for some Audiobooks (and a few other files) that seem to have disappeared from my computer's iTunes files over the years and I'm looking for the originals.
If they disappeared a long time ago, then they may no longer be in the TM backup. Once the TM backup drive fills up, TM will begin deleting the oldest TM backups to make room for the new ones. If your TM is large enough to have never been filled, then perhaps files that disappeared long ago would still be in the TM backup.
I don't ever have my computer hooked up to the internet when I'm backing up so I do not need to encrypt it further than it might get encrypted by Apple always.
The purpose of having encrypted backups is to ensure if your TM drive is lost or stolen that the person who has the drive won't be able access your personal data. Plus while the TM drive is connected to the computer it is visible to the system even if the TM backup is encrypted....after all macOS must be able to see & access the TM drive in order to perform the next backup.
I get the distinct impression that every backup is a distinct layer on top of the previous backup and preserving each one, That's the only way I can see calling it a Time Machine if you are supposed to be able to go back and look to a particular time to look for something. So I would need them to go back to when the missing audiobooks were still on it!
TM allows you to see different revisions of files from older dates as long as the TM drive has sufficient storage to do so. It is not guaranteed though. If the file is gone from your computer, then only the previous backup immediately prior to losing the file from the computer will be guaranteed to contain that missing file (if the TM drive is large enough, then the missing file will likely remain in the backup until the backup must be pruned).
TM is not an archiving type of backup solution. If you want to have backup archives, then you need to implement another backup solution.