There doesn't seem to be an option to do incremental/differential during the week. This would increase backup of Salesforce. This would increase speed and reduce storage usage allowing to have more backups avaiable.
- Last Post 29 August 2018
At the moment, Skyvia cannot perform incremental updates (records are not updated and backups are not overwritten) and cannot delete old backups automatically for now. However, this feature is on our roadmap. We will definitely post here the results as soon as possible.