Feature Request: Support for Proton Drive and Nextcloud/Owncloud with rclone
Suggestion
Feature requests to support one cloud or another must be a dime a dozen but there is a strong case to support Proton Drive specifically: First, it has become quite popular, second it's open-source and that's kind of rare in cloud offering, third and not least, there probably won't be anything from Proton themselves for a long while, Proton's team is small and busy.
Since Celeste (https://github.com/hwittenborn/celeste) is supporting it for synchronization, there may be some code reuse... possibly.
As for Nextcloud/Owncloud, well, it's already supported by Gnome in general via online accounts, it would make sense to also support it in Deja Dup, although it kind of already is since you can backup on a webdav server. It would just be more polished to have it as an official entry in the supported targets.