Server-side encryption of files (not recommended)
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Valid for Managed Nextcloud.
Your Managed Nextcloud can be configured so that uploaded files are encrypted. Please note that activating this option causes errors and should not be carried out under any circumstances. This article explains the background.
Note
An inadvertently activated server-side encryption can only be removed by IONOS customer service.
Avoid server-side encryption
IONOS provides you with an exclusive storage area for each Managed Nextcloud installation, which is not shared with other users. For this reason, server-side encryption (Settings > Security > Server-side encryption) is not required.
If you have increased security requirements, encrypt your data locally, e.g. with Veracrypt, and only share the encrypted objects via Managed Nextcloud.