Time Machine was designed as a backup system, which shares some requirements 
with but is not identical to a file versioning system. It sounds to me like 
what you're really looking for is the latter. To simplify my life, I would 
retire that drive as a backup drive and use it as an archive drive only. You 
can root around and it manually, but don't expect Time Machine to do anything 
meaningful with it.

> On Feb 15, 2017, at 8:13 PM, Michael <[email protected]> wrote:
> 
> 
> On 2017-02-15, at 7:06 PM, Carl Hoefs <[email protected]> wrote:
> 
>>> 
>>> On Feb 15, 2017, at 5:40 PM, Macs R We <[email protected]> wrote:
>>> 
>>> 
>>> 
>>>> On Feb 15, 2017, at 4:47 PM, Carl Hoefs <[email protected]> 
>>>> wrote:
>>>> 
>>>> I want my new system to inherit my old system's TM archives.
>>>> 
>>>> So when I do a backup, it augments the existing archive, and doesn't make 
>>>> an entirely new one from scratch, which would mean abandoning everything I 
>>>> have archived.
>> 
>> Okay, thinking about this a little more deeply, yes, I don't actually need 
>> the "all or nothing" perfect clone approach. But I do need access to the 
>> years of archives that are there. If I can go manually hunt and peck around 
>> for the files I need, I thought maybe TM could support it as a "static" or 
>> "archaic" archive or something. That's not really so unreasonable, is it? 
> 
> You are asking for two very different goals here.
> 
> If you want to continue backing up on the existing backup, you can do that.
> 
> tmutil inheritbackup machine_directory
> 
> Archives are *NOT* defined by special UUID's. That was true in 10.5, and 
> maybe in 10.6. I think it changed in 10.7; I know it is changed in 10.9.
> 
> BUT:
> 
> Your first backup will result in saying "These directories do not match", and 
> most of your files will be backed up from the current machine. This will 
> probably fill your drive, and it will delete some of your older backups -- 
> very likely most or all of the years of archives that are there.
> 
> If your goal is to be able to restore files off those archives, that is 
> different. You can treat them as just another read-only directory from 
> finder, and look around. I think finder is smart enough that if you copy 
> files out of a time machine archive, then it will remove the time-machine 
> specific extended attributes and restore the normal ones if any.
> 
> So what is your goal here:
> 1. Look through the files and restore them as needed, or
> 2. Use it as a destination for backing up and deleting the old backups as 
> needed to make new ones?
> 

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