File modifiers can change how a file is copied to the destination for one-way syncs.
File modifiers can be added in the Advanced tab of the sync item settings. Each file modifier is applied to all copied files by default and supports the same type of filters that can be applied in the Filters tab of the sync settings.
Add Tag
Adding a Finder tag allows to recognize all files copied during a sync, assuming that the tag wasn’t set before.
Compress
Compressing big or rarely needed files allows to save space, but requires expanding them before using them again.
Note: adding this file modifier or changing its filter after the first sync will cause the old uncompressed files to stay on the destination, unless the option Remove files not on source is active as well. In this case, the names of the files on the source are matched to the names of the compressed files on the destination, preventing a compressed file from being removed as long as the source file exists.
Note: since the compressed file usually has a different size than the original file, when determining which files have changed only the modification date is compared, even with the overwrite policy If modification date or size is different.
Create alias
Creating an alias pointing back to the source file allows to save space of rarely needed files, but renders the alias useless if the source file is deleted or disconnected.
Note: adding this file modifier or changing its filter after the first sync will cause the new aliases to automatically replace any old files with the same name. Changing the filter will cause any old aliases to stay on the destination, unless the option Remove files not on source is active as well.
Remove Extended Attributes
Extended attributes, such as Finder tags, are not copied.
Rename
Renaming files allows to change or delete characters that are not supported on the destination volume.
You can choose to find and replace text in a file name by selecting one of two operations: Exact match or Regular expression.
Note: adding this file modifier or changing its filter after the first sync will cause the files with the old names to stay on the destination, unless the option Remove files not on source is active as well. In this case, the names of the files on the source are matched to the names of the renamed files on the destination, preventing a renamed file from being removed as long as the source file exists.