ownCloud keeps a copy of your deleted files in case you need them again.
To make sure that the user doesn't run out of memory the deleted files app
manages the size of the deleted files for the user. By default deleted files
- stay in the trash bin for 180 days. ownCloud checks the age of the files
+ stay in the trash bin for 90 days. ownCloud checks the age of the files
every time a new files gets moved to the deleted files and remove all files
older than 180 days. The user can adjust this value in the config.php by
setting the "trashbin_retention_obligation" value.