hi, sorry, not sure what you need help with?
- how to perform the migration?
- how to
rclone servethe files after the migration has completed?
imo, i would trust not rclone serve sftp in production.
plain sftp server is battle tested over many decades and many millions of machines.
one possible advantage of rclone serve sftp is pre-caching the names of files and directories in memory, assuming you have enough free memory
i have a summary of the two rclone vfs caches