is nextcloud still the best to host a small amount of files that need to be accessible anywhere and backed up? and carddav caldav

If you need ONLY file hosting there are better alternatives(like Syncthing, for example). But if you need Contacts, Calendars, Music streaming(subsonic/ampache compatible) all-in-one - then Nextcloud is of course better. I mentioned only those Nextcloud apps, that i use myself, YMMV.