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When backing up your catalogs on macOS, Lightroom CC 2015.1/Lightroom 6.1 and later versions don't compress catalogs that are larger than 4 GB. This restriction was imposed in Lightroom (versions listed below) because the default macOS unzip utility is unable to handle archives larger than 4 GB. It reports such compressed catalogs as 'corrupted' when you try to extract them.
The following Lightroom versions do not zip catalogs larger than 4 GB:
- Lightroom CC 2015.7/Lightroom 6.7
- Lightroom CC 2015.6.x/Lightroom 6.6.x
- Lightroom CC 2015.5.x/Lightroom 6.5.x
- Lightroom CC 2015.4/Lightroom 6.4
- Lightroom CC 2015.3/Lightroom 6.3
- Lightroom CC 2015.2.x/Lightroom 6.2.x
- Lightroom CC 2015.1.x/Lightroom 6.1.x
Catalog compression in Lightroom CC 2015.8/Lightroom 6.8
Beginning with this release, Lightroom compresses all the catalogs when creating a back up — including the ones that are larger than 4 GB.
Extracting compressed catalogs larger than 4 GB on macOS
To extract such compressed catalog back up files on macOS, use third-party zip utilities like 7-zip, StuffItExpander, or any other utility that can handle extracting large compressed files.
Note:
In Lightroom CC 2015.8/Lightroom 6.8 (Mac), the size restriction for compressing a catalog has been removed. Compressing the catalog reduces the disk space consumed by the backup and also improves the backup time, especially when the backup destination is on a NAS (Network Attached Storage).
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