What is the best way to synchronize file resources of 2 distributed file servers in case the first file server fails?

Question

Data synchronization

There are 2 file servers, geographically distributed (in different regions).
I want to set up synchronization (or replication) of the file resources of the first server to the second, in case the first server lies down for good. Do not offer clustering (so as not to lay down), synchronization to a remote backup site is of interest.
On the first server there are files of various types (txt, docx, xlsx, exe, jpg, tiff), files opened by users in rw mode remain overnight.
There are also many small files (10-50 KB)
I tried DFS replication - I set it up one-way, but in fact if you add a file to a resource on which infa should only be collected - it is replicated in the opposite direction.
You only need to synchronize in one direction.
Объем информации ежедневно не большой, главная задача - как можно более качественно выполнять синхронизацию (уметь работать с открытыми файлами, длинными путями smb windows, работа по расписанию, возможность исключать определенные файлы/папки по различным признакам)

Answer 1

Возможно подойдет bittorrent sync/syncthing или банальный rsync