I’ve been using FileZilla Server, but constantly get “Detected non-empty blocksets with no associated blocks” and “The file duplicati-b947b2403b42xxxx.dblock.zip.aes was uploaded but the returned size was x and it was expected to be y”. I’m thinking that maybe a different FTPS server may work better for me.
Does anyone use a different FTPS server that they would recommend? A freeware option would be nice.
I’m using “FTP (Alternative)”. When I first set it up, I’m pretty sure that “FTP” was not connecting for me, so I went with “FTP (Alternative)”. But I just tried “FTP” now and it connected just fine. So I’m going to test that a bit.
If “FTP” doesn’t work, I think I will just try SFTP or S3 in order to get a complete working backup. I wish I had the time to help hunt down the cause of the error.
Switching from “FTP (Alternative)” to “FTP” appears to have resolved several issues I’ve been having with backing up via FTPS. Not sure why “FTP” did not connect when I first setup Duplicati, but it is working now.
There’s a new version of the third-party library for “FTP (Alternative)” trying to get out. The current one has a bug in recent canary builds that causes size errors of about 0.3 percent growth on downloads from UNIX-like systems. Or so I thought. If your “x” and “y” from original post were about that much, theory must be revised.
It’s good to have two FTP options because if one won’t work, maybe the other will, But FTP does have many inherent problems. At least FTPS reduces the danger of exposing unencrypted password on your network… Possibly it also helps detect end of file better. Ordinary unencrypted FTP can get short file and not notice it…
SFTP has issues too, but they’re in the implementation (library and its encryption are getting kind of old), whereas FTP is a protocol from year 1985, so its issues are partly a reflection of what was needed then.
Likely nothing’s perfect. S3 as mentioned by @Pectojin is probably the most recent protocol and code. Duplicati uses Amazon’s client. I don’t know how well Minio does, but https://forum.duplicati.com/search?q=minio seems to find more questions than complaints. One post that might be useful is this: