![]() If the modification date of the files on your destination are getting set to the date and time of the backup tasks, there's a good chance that AV software or some other background service is making changes to the files after CCC has copied them. When an AV application "touches" the file, however, or otherwise makes changes to the file, the modification date will be updated to the current date. Reading a file is not sufficient to change the file's modification date, so well-written AV applications should cause no harm by scanning the files that CCC copies. This filesystem activity prompts the AV software to scan the file, which is generally OK (albeit with a performance hit to the backup task). Some antivirus applications may actually change file modification datesĪfter CCC has copied a file to the destination, the very last thing that it does is to set the file's modification date to the modification date of the source file. ![]() You can avoid this recopying behavior by applying the same organizational changes to the destination prior to running your backup task. renamed or moved a folder that had a lot of data in it, that will result in many items being recopied to the destination because the path to those items has changed. If you have made large organizational changes on your source volume, e.g. ![]() Organizational changes will lead to large amounts of data being recopied If the amount of data copied is just a fraction of the total data set, then the amount of data being copied is probably normal. macOS is constantly updating various cache and log files, and these can really add up over the course of a day. It is not uncommon for as much as 2-5GB of files to be updated between daily backups, for example, even when it seems that you have made no changes to the source volume. If a file's size or modification date is at all different on the source and destination, CCC will copy that file to the destination.īefore concluding that CCC is recopying every file, open your most recent completed task in CCC's Task History window and compare the Total size of source data set and Data copied values. CCC determines that a file is different using its size and modification date. So if you complete a backup task, then run it again the next day, CCC will copy only the items that were created or modified since that last backup task. CCC will copy only items that are different between your source and destination.
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