Can anyone tell me what is the difference between this two FTP options and which one is recommended?
I tried to use and right now with vsftpd on my raspi, the FTP is not working but the FTP (Alternative) would work
Depending on the answer, I decide which road I choose
There’s your answer! Use the one that works with your particular FTP server.
But to be honest, I’d try to use a different protocol. FTP isn’t as solid as some of the others.
thanks, but this is just too less technical
Why do you think FTP is not solid ? and compared to which ones?
If it is about security, it has nothing to do with solid. If the implementation is making backups corrupt, I would understand your statement but than, why is it still available as an option in duplicati?
Anyhow, I want to reduce CPU usage on the destination. Right now, I am using SSH File Transfer Protocol through a VPN tunnel to transfer data. This makes not much sense from the perspective of transferring encrypted data, too much encryption on transit, too much overhead. The idea is, using a less CPU intense protocol for/to the destination and the VPN is taking care of the encryption on transit anyhow.
The destination is a Raspberry Pi 1 with some USB disks connected, small, not very power hungry but also low on CPU and memory (and was available for free). Anyhow, actually a perfect backup destination, but optimizing the usage is one of the things I play around with right now.
It’s widely implemented, with lots of implementation variations which don’t always work together well. Duplicati provides two client implementations in the hope that one works. Original pre-1985 design is also flawed, as data transfer is just a TCP stream so doesn’t notice errors like newer protocols might:
A comment on transfer modes. The stream transfer mode is
Postel & Reynolds [Page 19]
RFC 959 October 1985
File Transfer Protocol
inherently unreliable, since one can not determine if the
connection closed prematurely or not.
FTP is very simple and easy to get on small devices, so there’s a demand for it even if it’s not the best. Given a reasonably solid (and preferably secure, since it’s clear text) network, FTP can be adequate… I’m not going to try to say what’s best, but FTP is possibly as simple, weak, and universal as there is…
FTP is the .NET Framework implementation from Microsoft. FTP (Alternative) is either FluentFTP or its predecessor under a different name. You can see an example of attempting to adapt to specific server.