Can Viruses spread while transferring files via FTP protocol to unshared NAS drives ?

Can Viruses spread while transferring data Files via FTP protocol across a network ?

I have a backup server application running on a machine that is not shared and is not connected to the internet, all interaction from other machines with this Backup Server is via Sockets. Only this machine has a Mapping to the NAS drive.

My applications Client modules running on all Client Machines connect via FTP to the NAS drive for sending their data.

I am using Delphi on Windows.

Assuming that the data files are not yet infected but Client machine EXE's are infected with Ransomware Virus will the data be safe on the NAS drive ?
Allan_FernandesAsked:
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JohnBusiness Consultant (Owner)Commented:
If the file being sent has a virus, yes, the resulting sent file will have the same virus.

If the file being sent is clean, sending by FTP will not attract a virus.
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gheistCommented:
Once can patch files in flight over unencrypted protocols. Better use SFTP.
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Allan_FernandesAuthor Commented:
The workings are within a LAN, can the viruses patch the files at the lower layers in such scenario ?
Also if the customer's NAS drive has SSL/TLS then I have the facility to send it accordingly.
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JohnBusiness Consultant (Owner)Commented:
If they are within a LAN, viruses will come in the normal way:  Loose nuts behind the keyboard in the vast majority of the cases. They will not come in from a file transfer. I don't ever see this at my clients.
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Allan_FernandesAuthor Commented:
HaHa!
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JohnBusiness Consultant (Owner)Commented:
Thanks and I was happy to help.
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