SurfDrive is a cloud storage service provided by SurfNet, on behalf of the joint dutch universities. It's underlying protocol is that of NextCloud, so you can connect any NextCloud client to synchronize your files to SurfDrive. The connection url will be: https://surfdrive.surf.nl/files and to log in, select Leiden University and use your ULCN credentials. More details, including apps for Android and iOS, can be found at the SurfDrive website