On Mar 29, 2015, at 1:55 PM, Michael <[email protected]> wrote:
> On 2015-03-29, at 7:07 AM, Macs R We <[email protected]> wrote:
>
>> Maybe I’m misunderstanding the big picture here, but Time Machine allows you
>> to specify files and volumes that are not to be backed up; and, although
>> I’ve never tried it, I would try setting discretionary read-only permissions
>> on the bundle and/or the interior volume to prevent any accidental
>> modification of the contents.
>
> The big picture, roughly:
> I have some partitions that are historical data. I don't want them to ever
> change. But I do want them in the backup.
>
> Attempting to mount those partitions as read only, to prevent them from
> changing, messes up Time Machine's ability to just say "these have not
> changed".
Is there a need to mount the sparse image at all? If the contents within the
image have not changed, then the image file should (I think) remain unchanged,
as well, and thus Time Machine will not back it up unless/until it changes. It
will be backed up initially, but will always be ignored for each subsequent
backup. Is this not adequate for what you need?
Matt
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