Now I can confirm that this service works as it should.
The problem was in server timeout, developer confirmed.
The service owner has changed his algorithm, so now only dozens of routes are established, not thousands.
Second, OpenVPN now ignores "max-routes" option.
Please don't forget to set...
You can try to turn off Memory Management: Regularly flush caches in Tools to avoid your backup corruption.
What about speed, SMB is slightly slower than USB, especially USB 3.0. And OS X always throttles wireless backup speed to lower power consumption and to keep WiFi throughput well. For me...
I begun expecting troubles with TM backups a couple weeks ago as I upgraded my router to 380.58.
Now my fresh backup lives only 7-10 days, then it reports that sparse bundle is corrupted.
Before upgrade encrypted wireless backup worked on my ASUS RT-AC56U a half year without any problem.
And...
Same trouble with Tomato firmware.
I guess it must be some option to simply increase this timeout manually, but I have absolutely no idea in which direction I should dig.
But there is at least one success story (in Russian) from some user that have forced her router to work with prostovpn.org...