It is not possible to rsync (executed as ssh) your files with a smb-Folder (NAS
backup). The login process is not working!

Leap 15.6 - KDE plasma
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a) within X11 and Wayland:
rsync -r -s -e ssh <source> <destination>
=>you receive a login error, no login possible. There is no connection between
rsync and ksshaskpass.

b) within X11:
SSH_ASKPASS_REQUIRE=force rsync -r -s -e ssh <source> <destination>
=> you receive an error "Could not load the qt platform..."

c) within Wayland:
SSH_ASKPASS_REQUIRE=force rsync -r -s -e ssh <source> <destination>
=> OK, works!

d)
grsync is not working in all scenarios (a, b, c)

Bug:
I have this already reported with Tumbleweed one year ago (Bug 1207402).
In Leap 15.5 all worked fine.