You exclude these files for several reasons: Lightroom creates preview files for your photos, and these previews can grow to be several hundred gigabytes (GB) in size over time. What to exclude from your backup file selection To learn more about managing metadata, see Adobe Lightroom help articles Metadata basics and actions and Advanced metadata actions. You can also configure Lightroom to do this automatically, although performance may be impacted. Writing metadata to your files or XMP sidecar files as part of your regular workflow also makes it easier to import images into Photoshop and other Lightroom catalogs. Since metadata is either written into the original file (in the case of JPEG, TIFF, PSD, or DNG formats) or to XMP sidecars at the location images are stored (in the case of all other RAW files), Code42 automatically backs up this metadata as long as the original image files are already included in your backup file selection. It's still important to keep your Lightroom catalogs selected for backup, but writing out XMP data regularly makes restoring and importing files easier in the future, while also preserving your edits and embedded data. This data is stored in Lightroom's catalog files, but it can also be written to separate files to improve portability and provide redundancy in case a catalog becomes corrupted or is otherwise unavailable. Metadata in Lightroom includes a record of edits made to images, IPTC/EXIF data, and other data related to the images.
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