You may want to erase all or very old recorded content on a feed sometimes, do this in the 'Storage' tab using the red 'Delete recorded data' button at the bottom. You can choose type of content to delete as well as the age of the content to delete.
For example you can delete all images older than 2 years, this will leave video content in tact. Note that deleting images means you won't be able to regenerate time-lapse video to create custom videos or rebuild in case of accidental video deletion.
Deletion is not reversable!
