Managing Deleted Files
When you delete a file in ownCloud, it is not immediately deleted permanently. Instead, it is moved into the trash bin. It is not permanently deleted until you manually delete it, or when the Deleted Files app deletes it to make room for new files.
Find your deleted files by clicking on the Deleted files button on the Files page of the ownCloud Web interface. You’ll have options to either restore or permanently delete files.
Deleted files are not counted against your storage quota. Only files that originate with users count against their quotas, not files shared with them that originate from other users. (See webgui/quota to learn more about quotas.)
What Happens When Shared Files Are Deleted
Deleting files gets a little complicated when they are shared files, as this scenario illustrates:
User1 shares a folder "test" with User2 and User3
User2 (the recipient) deletes a file/folder "sub" inside of "test"
The folder "sub" will be moved to the trashbin of both User1 (owner) and User2 (recipient)
But User3 will not have a copy of "sub" in her trash bin
When User1 deletes "sub" then it is moved to User1’s trash bin. It is deleted from User2 and User3, but not placed in their trash bins.
When you share files, other users may copy, rename, move, and share them with other people, just as they can for any computer files; ownCloud does not have magic powers to prevent this.
How the Deleted Files app Manages Storage Space
To ensure that users do not run over their storage quotas, the Deleted Files app allocates a maximum of 50% of their currently available storage quota to deleted files. If your deleted files exceed this limit, ownCloud deletes the oldest files (files with the oldest timestamps from when they were deleted) until it meets the memory usage limit again.
ownCloud checks the age of deleted files every time new files are added
to the deleted files. By default, deleted files stay in the trash bin
for 30 days. The ownCloud server administrator can adjust this value in
config.php file by setting the
value. Files older than the
trashbin_retention_obligation value will
be deleted permanently. Additionally, ownCloud calculates the maximum
available space every time a new file is added. If the deleted files
exceed the new maximum allowed space ownCloud will expire old deleted
files until the limit is met once again.