I have the same problem but no solution yet.
You cannot use ordinary FTP because the server running on the TiVo has to be able to address the MFS media partitions. You cannot navigate to them just using ordinary Linux commands or programs.
The official TiVo Desktop software does not work. I have read that it stopped pushing videos some time in 2016. PyTiVo has a push feature but it also seems to be broken. MFS_FTP might work. A version of MFS_FTP is installed by the Oztivo nodding script. I can get it running and the FTP program on my PC detects the server but no files are shown. It is possible the version which is installed is not quite right. (I found that the version of dbset installed by the nodding script did not work so I replaced it). I have thought about sourcing a different version of MFS_FTP but have not been able to find one yet.
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