Bulk backup to one server?

Question

Backup

There are 6 servers (WS 2008, WS 2012), geographic at different points. Each database is backed up daily 1C. file mode. The output is *.dt files.
Guys, how can I collect all this via the Internet every day for one car?
An important point. There should not be shared folders for all 6.
Currently implemented through Yandex disk (sharing folders for other accounts), but there is one BUT!
When you transfer files from the POISON folder to another location, the POISON throws them into its trash, and accordingly after a couple of days it writes that there is no disk space (10GB limit is free.), And the backups are no longer transferred.
Prompt still methods of realization of the given problem (it is desirable free).
Thanks in advance.

Answer 1

Hi
https://syncthing.net/
No clouds needed, everything is synced between machines. There is no need to transfer anything anywhere, I made an archive, it was synchronized with the main machine. Updated the archive, it was synchronized again.
Here is an overview - https://en.wikipedia.org/wiki/Syncthing

Answer 2

Each database is backed up daily 1C. file mode. The output is *.dt files.

When backing up, *.dt files cannot be obtained.

Guys, how can I collect all this via the Internet every day for one car?

FTP.