[chtfn]

Hmm I wonder what the author means by: "Aside from the fact that this banner looks like something free software would install as a toolbar, [...]"

As alternives, depending on your requirements, I recommend SpiderOak, SyncThing, or a third-party offering / your self-hosted Nextcloud.

[guruz]

... or ownCloud.

[favadi]

nextcloud and owncloud are not basically same thing?

[compuguy]

Next cloud is a fork of owncloud. Right now they haven't significantly diverged yet.