I can’t speak to using Radicale, but I sync both my address book and my
calendar from Kontact (KAddressBook and KOrganizer) to a Davical server.  I
am also running Testing and have been using this configuration for several
years.  It generally works well, although sometimes there are some glitches
with Akonadi, especially when part of KDE has updated to a new version but
part
still hasn't.

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