Yandex.Disk Cloud Storage creates temporary files in c:\Users\%username%\YandexDisk\.sync\tmp\ and if the program closes unexpectedly remain don't need the files. the size of these files can be several gigabytes.
please add support for Yandex.Disk
and in the meantime, you can control them yourself via an INCLUDE as it may take time (or never) for it to be officially added.