Notes: Memos

https://www.usememos.com/

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Calendar: still Nextcloud (caldav is fast enough in nextcloud, even with sqlite) or SOGo

https://sogo.nu

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Files: Owncloud OCIS (not the old PHP one)

https://owncloud.dev/ocis/

Connect with more v(erbose) output to your server. Example:

ssh -vvvv @

… and read line by line.