Acronis Cyber Protect Home Office, Acronis True Image 2021, 2020, 2019, 2018, 2017 and 2016 support the following network protocols:

SMB (Server Message Block)
CIFS (Common Internet File System, Microsoft`s reworked version of SMB)
SMB2 (introduced with Windows Vista)
SMB3 (introduced with Windows 8. Latest update is SMB 3.1.1 as of November 2019, introduced with Windows 10)
FTP (File Transfer Protocol, supported only in Windows version of Acronis True Image, Linux and WinPE-based rescue medias)
AFP (Apple Filing Protocol, supported only by Mac version of Acronis True Image)

The following protocols are not supported by Acronis Cyber Protect Home Office, Acronis True Image 2021, 2020, 2019, 2018, 2017 and 2016:

FTPS (FTP with SSL/TLS)
SFTP (FTP over SSH)
WebDAV (Web Distributed Authoring and Versioning, extension to HTTP)
iSCSI (Internet Small Computer System Interface, SCSI over IP, used in some hybrid NAS+SAN models)