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I have one folder which is backed up every hour by both Time Machine and ChronoSync. Once that has been done, change its permissions or xattrs, and watch it being backed up again an hour later. Put a large document, such as my 7.9 MB PDF, in that folder, and let it get backed up the first time, as it stands. It’s easy to demonstrate this on a folder which is being backed up hourly. That’s one drawback of conventional backup tools, compared with Time Machine. There’s no way to make that hard link but add on the changed permissions or xattrs, for instance. As that also connects to its old permissions, other attributes, and xattrs, it isn’t an accurate copy of the file as it has now become. The reasoning behind this is that, in a Time Machine backup, when a file isn’t backed up, a hard link is instead created to its previous copy. As actions on the file’s attributes and its xattrs are recorded in FSEvents, they will normally result in a fresh backup being made of the file, even though its data hasn’t been changed. Instead of looking at file modification dates, it looks in a database stored on each volume which records all the events which occur in the file system, FSEvents. As changing permissions or xattrs doesn’t affect file modification dates, those actions won’t cause the file to be backed up again. If that date is more recent than the last backup, that file will be backed up in the next backup. Most third-party tools, like ChronoSync, look at file modification dates to determine whether a file needs to be backed up. This all depends on the method that the backup system uses to determine which files need to be backed up. But the same doesn’t happen when you use a third-party backup app instead of Time Machine. This is a particular concern when you change a lot of permissions, by resetting or repairing Home folder permissions, or tag a large folder using Dintch. Some users have noticed that changing permissions or xattrs does normally trigger a fresh copy of that file to be made when Time Machine next performs a back up. In fact, unless you look at the xattrs using a utility such as my xattr editor xattred, you won’t even notice what’s happened. So adding or changing a xattr won’t change the date of modification, nor the date that the file was last opened. Xattrs aren’t even stored in the main data area of a volume, but apart, in the file system metadata. In Dintch’s case, it calculates the SHA256 digest (checksum) of a file and writes that to a custom xattr.Ĭhanging a file’s xattrs doesn’t alter the data in the file itself. Some apps, including my utility for checking the integrity of files, Dintch, don’t touch the data in a file, or its regular attributes like datestamps or permissions, but instead write to xattrs.
As you do that without even opening the file, changing permissions alone won’t affect the Last opened date either. If you were to change some of that file’s attributes (metadata), such as its permissions, that also doesn’t alter the date of modification.
CHRONOSYNC DOWNLOAD PDF
This large PDF file hasn’t been modified since it was created almost seven years ago, but macOS also tracks when it was last opened, through an extended attribute (xattr) of type, and the datestamp there is used for the Last opened field. When you change the data within a file, its date of last modification is also altered. This article explains a bit more about some of these which could readily confuse. It’s not always clear which of these should be expected to change when different parts of a file change. You will always have any file within reach on any of the devices.Files in macOS have a lot of attributes, or metadata, which provide important information, such as the date that they were last modified. Very useful when you have a desktop computer and a laptop. With her you will be able to synchronize folders and files between two Macs. One of the great utilities of this new version is synchronization.
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Preview the content of the copy, in order to be able to correct mistakes before they are made.Īll of the above, in addition, It is free for those who are already users of the program and who want to update. Establish schedules for the program to do it on its own. Synchronize files and folders In a simple way. With the program we can, make a security copy, even in a simpler and more precise way than with Time Machine.
This program is a true Swiss army knife with which we can perform security tasks on our Mac, in a very simple way. They are 15 days free so you can assess whether this product is worth it or not.ĬhronoSync reaches its version 4.9.6 compatible with macOS Catalina
CHRONOSYNC DOWNLOAD TRIAL
If you don't have ChronoSync yet, you can download the trial version.
CHRONOSYNC DOWNLOAD INSTALL
Users of previous versions can install the update for free. ChronoSync is a complete solution All-in-one for file syncs, backups, bootable backups, and cloud storage.
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