An OpenSSH server will allow you to connect with both SCP and SFTP. The former is for quick encrypted file transfers, the latter is a full featured Secure FTP protocol that will work with clients like FileZilla.
I use SCP to copy my Router and Switch configurations to back them up. SCP allows me to do this automatically using Cisco's Archive construct or directly from the IOS CLI. I then connect to the backup server using SFTP to recover or review those backup configurations from a rich client like FileZilla.
This beats TFTP which A: has problems with files over 16 MB (think IOS images) and B: adds a layer of encryption over my configs that FTP does not since Level 7 encryption on cisco devices is easy to break. This protects my configs in transit and C: uses TCP to guarentee delivery of my files, as TFTP uses UDP.
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