Backup strategien mac os x
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We're sorry. We were unable to submit your feedback. Try again. Only Finder copies individual comments. For files with resource forks, the modification date is clobbered. This has already been noted here and here. To be able to unconditionally preserve file ownership, a copying engine must be run as root.
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All command-line tools and utilities that have explicit authorization facilities support such a mode. The only exception is the Finder, which is usually run under some nonroot user account. Hence, one cannot expect the Finder to preserve file ownership.
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Hence, the nonpreservation of creation dates only manifests if creation date and modification date of the original file were different to begin with. Should you want to reproduce my tests, keep this in mind. With the advent of Tiger, Apple touted that they had enhanced all BSD file manipulation utilities to be metadata-aware; i.
Basically, Apple patched the BSD utilities to fall back to facilities provided in copyfile. FinderInfo for extended Finder flags and com. ResourceFork for the resource fork. This is the only way for BSD tools to directly access this data. There is no way for a BSD-level tool to preserve the creation date, unless Apple fixes the Darwin kernel. Update The bug is filed as After considering comment 30 below, it seems that my diagnosis actually comes to the wrong conclusion. It should be obvious from the above that file copying on Mac OS X under the most simple circumstances is already a fairly complex task.
In real-world situations, many more issues may appear. It is advisable to use only tools that have a good track record of being used for backup purposes and that are actively supported. Unfortunately, the state of low-level file copying tools on the Mac is sad. There is no all-round solution.
Every tool has its drawbacks. Once a full system backup is restored, it needs to be made bootable. Many of their properties are a direct function of the underlying engine. This is not intended to be a complete review of backup software functionality. Disk utility is easy to use for a quick volume backup. Since it uses the asr engine, its metadata preservation properties are generally good.
Still acceptable to use, but one should be aware of the limitations of the ditto engine. Mac account. Use the Finder only to backup small amounts of user data. The Finder is not suitable for backing up an entire volume.
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In my above list, many backup tools are still missing, such as Unison and Retrospect. I have no further information about these tools at this time. What is also missing is a discussion of archive formats such as tar, cpio, and disk images. Archives can be potentially useful for encapsulating backups and for storing backups on foreign file systems that do not support OS X metadata.
In my eyes, there is no silver bullet for backup and cloning under Mac OS X. If you have any better solutions than the ones presented above, please let me know in the comments. Update I have now posted an extensive analysis of free and commercial GUI-based tools. Tri-Backup http: The surprising conclusion is that almost all Macintosh backup or cloning programs do not fulfill their primary purpose, i.
The tools that fail are harmful because they generate a false sense of security. Even more exasperating is that many of these tools cost significant amounts of money. The only laudable exception is the great SuperDuper application, which performs flawlessly. Maurits writes about the abysmal state of Mac backups here and here. It works with everything and is perfect for tape backups. No, I wish myself an engine as strong as SD existed. But Dave Nanian told me that this interface is neither documented nor stable nor supposed to be used in the first place.
Peter of the Norse: However, whenever you want to perform a backup short of backing up your entire disk, dd is useless. The focus here has been on file-by-file copying engines, which are of course much harder to build. Especially with valuable data at stake. Mac admins everywhere need to read this and evaluate if their processes are as bulletproof as they might think.
It looks like.
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DS Store does not contain the Color labels. I created a test directory with a folder and a text file with Color labels, Spotlight Comments, and custom Finder icons. I closed the test folder in Finder, removed. When I opened the test folder again, only the Spotlight Comments were gone — the Color labels and custom Finder icons were still there.
Color labels are stored in the Finder flags, custom icons in the resource fork. What Matt eluded to was the window background color and the icon size setting for the folder. My bet would still be. With my above scenario, when I used ditto to duplicate a file with a Color label and a custom Finder icon, both the Color label and the custom Finder icon were preserved.
Maurits, 17 how much do you want to bet ; Set a background color and change the icon size, close the folder, remove. The background color and icon sizes are preserved. I guess it might be a weird Finder caching problem. Gotta keep remembering to Relaunch the Finder to get rid of that. Arek Finder caches like crazy. I ran some tests of changing icon size and folder background color while watching fslogger from http: Yeah, I had a look at the contents of the.
The format of the. Man page. DS Store functionality, as most all?
Up close: Apple's Mac OS X 10.5 Leopard
On logging back in, you should have a clean folder. Thanks for proving me wrong! But that was of course stupid. Interestingly, Apple has never pointed out this call in reponses to my bug reports to them. A file-level backup utility will necessarily modify the access time, unless it specifically resets it e. It is actually a good call to make to return metadata in bulk, or if you want to be very selective about what you want.
Or if you want the creation date! It was an exhaustive comparison, but the conclusion was that only SuperDuper! As someone who has paid for Retrospect and Carbon Copy Cloner this was a bit disappointing. Retrospect is far from perfect but you can create a lot of custom scripts. My complaint with Carbon Copy Cloner is the automation. I will keep using Retrospect for regular user directory backups and maybe switch to SuperDuper!
I think it would be really, really useful if somebody would create a set of unit tests for backup tools. Maybe you already have? Something like this: Create a directory with a bunch of files or programs that create files , each of which tests one aspect of file copying. Also write a program perhaps one for each file that can analyze the results of a copy, either by testing directly for the attribute in the copy or by comparing before vs. Make it modular so that new tests can be added as new failure modes are detected.
This would give developers including Apple! Oh, and you have my deepest gratitude for this article! Robert J.
Has anyone analyzed ChronoSync? BRU made bold claims about it… But it will be a commercial item or at least it requires one. Requires both ends to be running Mac OS X The Readers Digest Condensed Version therefore, for non-geeks, would be…. You do not mention hdiutil anywhere.
I was under the impression that Disk Utility used hdituil to create images from devices or folders. I have been using this as a backup method for sometime and have successfully restored bootable disks from these images using Disk Utiltity, which does use asr for this purpose.
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However, in general you point out into an interesting direction. What about SilverKeeper?
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Validation would be useful. EAs are solidly here, so they are a different situation. In this respect, my view that Tiger is a transitional OS is reinforced — a lot of technology has been thrown into it, and not all of it has been realized yet. Chronosync 3. Have anyone done testing with bacula? Manipulating the bewildering array of complex filesystem metadata is a constant chore for MacOS users, and these tools are a step in the right direction, if nothing else.
What would be really great was, if you could explain where all those nifty metadata are actually stored in the filesystem. All this would help people to fit together low level implementation with higher level abstraction. For more information visit: Articles , backup , Docs ]. More interviews: Articles , backup , xen ]. Access count: