CobianSoft

Thank you, but I still not understand why do problem occur to me. Tried to completely uninstall deleting all configuration files and install 0.9.55 BETA. Problems still persist. Getting errors
ERR 2021-11-23 15:09:30 An error occurred while uploading the file "E:\Backups\202111182+300+.rar" to "/Backups": An I/O exception occurred.
ERR 2021-11-23 15:11:13 An error occurred while uploading the file "E:\Backups\202111222300+.rar" to "/Backups": Input string was not in a correct format.

Installed CR on another computer with windows 7. Tried to backup to the same ftp server. All works without problems.

So I decided on my windows 2016 server to switch from ftp to sftp destination. Works without problems. So I solved the problem that way.

It's always a good idea to use sftp instead of ftp. It uses only one port, it's much more standard, more robust, safer and more firewall friendly. The ftp protocol is ancient and should , in my opinion, never be used if there is an alternative.

Thanks again.