[pavel_lishin]

Does it do selective sync? e.g., HOME:/media/pictures contains folders for 2014...etc, and LAPTOP:/media/pictures/ only contains 2014, and any changes to LAPTOP:/media/pictures/2014/ get propagated to HOME:/media/pictures/2014 etc?

[Tyrannosaurs]

It's not a sync service, it's a backup service.

The flow is directories on your machine > BackBlaze.

Anything in the other direction is manual.