Nextcloud.

German open-source self-hosted file sync, share, and backup platform

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Acronis
Swiss cyber protection company providing backup, disaster recovery, and secure file sync
CH · commercial
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Bareos
German open-source enterprise backup solution forked from Bacula
DE · open-source
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BorgBackup
Open-source deduplicating archival backup program with compression and encryption
DE · open-source
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Ceph
Open-source software-defined storage platform providing object, block, and file storage at scale
DE · open-source
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Contabo
German hosting provider offering affordable object storage and backup in European data centres
DE · commercial
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Duplicati
Open-source backup client storing encrypted backups on various cloud storage services
DK · open-source
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Exoscale
Swiss cloud provider offering S3-compatible object storage from European data centres
CH · commercial
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Hetzner
German hosting provider offering affordable dedicated servers, cloud storage, and backup solutions
DE · commercial
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