Perhaps disable writable old files in excess of 50% of free space?
Or versioning works only automatic?
It's working automatically (make sure the cronjobs run properly) but you have a few options you can change in your config/config.php:
/**
* File versions
*
* These parameters control the Versions app.
*/
/**
* If the versions app is enabled (default), this setting defines the policy
* for when versions will be permanently deleted.
* The app allows for two settings, a minimum time for version retention,
* and a maximum time for version retention.
* Minimum time is the number of days a version will be kept, after which it
* may be deleted. Maximum time is the number of days at which it is guaranteed
* to be deleted.
* Both minimum and maximum times can be set together to explicitly define
* version deletion. For migration purposes, this setting is installed
* initially set to "auto", which is equivalent to the default setting in
* ownCloud 8.1 and before.
*
* Available values:
*
* * ``auto``
* default setting. Automatically expire versions according to expire
* rules. Please refer to :doc:`../configuration_files/file_versioning` for
* more information.
* * ``D, auto``
* keep versions at least for D days, apply expire rules to all versions
* that are older than D days
* * ``auto, D``
* delete all versions that are older than D days automatically, delete
* other versions according to expire rules
* * ``D1, D2``
* keep versions for at least D1 days and delete when exceeds D2 days
* * ``disabled``
* versions auto clean disabled, versions will be kept forever
*/
'versions_retention_obligation' => 'auto',
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