How to retrieve deleted files

my mac book is synced with my cloud duo over lan… for some reason i was not able to access my cloud duo for some days. so i restarted it today and it came on again but suddenly files on my macbook started getting deleted and i need these file desperately. pls help. i saw instructions about using wd sync to access previous versions of file but i cant seem to find wd sync software to install. pls help. i am completely lost


You could refer to the following link: