Synology Drive (on-prem).

On-prem file sync and sharing on Synology NAS; Synology Inc. is Taiwanese, sovereign when used on a local NAS

Facts

Cozy Cloud
French personal cloud platform for storage, contacts and finances
FR · open-source
↗
Ente
Encrypted photo storage and backup as Google Photos alternative
NL · open-source
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Filen
German zero-knowledge encrypted cloud storage with high security
DE · open-source
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Internxt
Spanish privacy cloud storage with zero-knowledge encryption
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Jottacloud
Norwegian cloud backup and storage
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kDrive (Infomaniak)
Swiss cloud storage by Infomaniak with office suite and collaboration
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↗
Koofr
Slovenian cloud storage with end-to-end encryption and multi-cloud connection
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↗
luckycloud
German cloud storage service with servers exclusively in Germany
DE · commercial
↗