Cache Directory Tagging

[gary-kim]

Feature request

Description

Use the Cache Directory Tagging Specification for the preview cache directory. This is also supported by GNU Tar and Restic to exclude directories from backups.

Benefit / value

The previews are generated from data the server already has so they don't need to be in backups. This can help to reduce backup sizes for Nextcloud.

Risk / caveats

Perhaps people would like to keep backups of their preview cache? This could be made configurable.

Also, I think this may require a change in the server as well.

Are you a developer willing to implement this feature?: yes. I may pick this up in a bit.