HandyBackup 7.4 & ReadyNAS OS 6.1

In the FTP settings on the ReadyNAS, Masquerading is enabled, and the masquerade address is set to the DDNS hostname I use for HTTPS & FTP connections.

This is from FileZilla:
Status: Resolving address of [NAS DDNS]
Status: Connecting to [NAS IP]:21...
Status: Connection established, waiting for welcome message...
Response: 220 ProFTPD 1.3.4c Server (NETGEAR ReadyNAS) [NAS IP]
Command: AUTH TLS
Response: 234 AUTH TLS successful
Status: Initializing TLS...
Status: Verifying certificate...
Command: USER SQL2
Status: TLS/SSL connection established.
Response: 331 Password required for SQL2
Command: PASS ***************
Response: 230 User SQL2 logged in
Command: SYST
Response: 215 UNIX Type: L8
Command: FEAT
Response: 211-Features:
Response: MDTM
Response: MFMT
Response: TVFS
Response: UTF8
Response: AUTH TLS
Response: MFF modify;UNIX.group;UNIX.mode;
Response: MLST modify*;perm*;size*;type*;unique*;UNIX.group*;UNIX.mode*;UNIX.owner*;
Response: PBSZ
Response: PROT
Response: SITE MKDIR
Response: SITE RMDIR
Response: SITE UTIME
Response: SITE SYMLINK
Response: REST STREAM
Response: LANG en-US.UTF-8*
Response: SIZE
Response: 211 End
Command: OPTS UTF8 ON
Response: 200 UTF8 set to on
Command: PBSZ 0
Response: 200 PBSZ 0 successful
Command: PROT P
Response: 200 Protection set to Private
Status: Connected
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Response: 227 Entering Passive Mode (68,32,176,66,214,218).
Command: MLSD
Response: 150 Opening BINARY mode data connection for MLSD
Response: 226 Transfer complete
Status: Directory listing successful
Status: Retrieving directory listing...
Command: CWD /Backup
Response: 250 CWD command successful
Command: PWD
Response: 257 "/Backup" is the current directory

I'm so frustrated w/HandyBackup and this ReadyNAS.
HandyBackup doesn't do implicit FTPS. OS 6.1 doesn't do explicit FTPS or SFTP. OS 6.1 doesn't have a VPN client. Neither HandyBackup nor OS 6.1 have any documentation for their WebDAV support. Comcast had to have a combo modem/router, couldn't just provide a modem with their Extreme 105 service (which doesn't get anywhere near 105Mbps).