# RFC: Syncing extended attributes

**URL:** https://forum.syncthing.net/t/rfc-syncing-extended-attributes/18452
**Category:** Development
**Created:** [May 19, 2022, 7:10am UTC](https://forum.syncthing.net/t/rfc-syncing-extended-attributes/18452 "2022-05-19T07:10:41Z")
**Posts on this page:** 1
**Showing post:** 19

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### Author: ![Dan](https://forum.syncthing.net/user_avatar/forum.syncthing.net/dan/32/5894_2.png) [@Dan](https://forum.syncthing.net/u/Dan)
#### Post date: [June 22, 2022, 4:02am UTC](https://forum.syncthing.net/t/rfc-syncing-extended-attributes/18452/19 "2022-06-22T04:02:40Z")

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Some Googling later, and I discover that both Resilio and DropBox use a similar extended attribute mapping schema and only whitelists a handful of MacOS specific attributes.

- DropBox: hardcoded list of Apple-only extended attributes and how they’re mapped onto other operating systems: [What extended attributes does Dropbox support? | Dropbox Help](https://help.dropbox.com/installs-integrations/sync-uploads/extended-attributes)
- Resilio: controlled by a per-sync folder whitelist file that by default only includes some Apple-specific extended attributes (can be extended by adding exact name matches). Stored in stub-files on file systems that don’t support it: [https://help.resilio.com/hc/en-us/articles/204754729-Alt-Streams-and-Xattrs-in-Sync](https://help.resilio.com/hc/en-us/articles/204754729-Alt-Streams-and-Xattrs-in-Sync)
- iCloud unsurprisingly also whitelists some Apple-specific extended attributes.

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