Add Backblaze B2 to supported external storage.
Backblaze is one of the least expensive storage providers and one of the most reliable.
Hey, i did the following two searches:
https://central.owncloud.org/search?q=Backblaze, https://github.com/owncloud/core/search?q=Backblaze&type=Issues
and found another user asking for the same in Backblaze B2 integration as as well as a feature request in https://github.com/owncloud/core/issues/21304#issuecomment-166118117 where some one said that this should be implemented as an ownCloud app and how to do that.