On 2008-06-18 02:04:10 +0100, Howard Brazee <howard@[EMAIL PROTECTED]
> said:
> On Tue, 17 Jun 2008 23:01:58 GMT, me@[EMAIL PROTECTED]
(Király) wrote:
>
>> In comp.sys.mac.system Howard Brazee <howard@[EMAIL PROTECTED]
> wrote:
>>> So if I have my encrypted dmg file, I can tell Time Machine to go
>>> ahead and back it up, and it will automatically not fill up every time
>>> I change a file within it? Nothing for me to do?
>>
>> If your image is a sparse *bundle*, then yes.
>>
>> I have a sparse bundle that is 1.27GB in size. Inside are 87 or so
>> bands (files) of 16MB each. If I add another 10MB of data to the
>> image, just one of those bands gets modified, and/or one more band gets
>> created. The rest of the bands remain intact. So the next time Time
>> Machine runs, it only needs to add the changed and/or new bands to the
>> TM backup disk. If this were a regular disk image, TM would add the
>> whole 1.27GB image file over again.
>>
>> You should be able to convert your regular sparse image to a sparse
>> bundle with Disk Utility's Images -> Convert menu item. Or, create a
>> new empty sparse bundle, move your files to it, and delete your old
>> image.
>
> Get Info didn't tell me anything about "sparse", so I'm guessing my
> .dmg file is neither. I never heard of that word with regards to OS
> X before this thread. I did look up "sparse" in _Mac OS X: The
> Missing Manual_, and see that I could have created it with either
> option. I suspect I did so with neither option (or else I'd see it in
> Get Info).
Sparse bundles were introduced in Leopard, so old books won't mention
them.
Cheers,
Chris
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