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Also, there needs to be some accounting of files in the trash, so that "df" does not show the filesystem as 100% or 90% full all the time, but rather show only the non-trash space usage (= real usage - trash usage).

Per-user Recycle Bin

It can define a per-user RECYCLE/UID directory that is owned by that UID and mode 0600 to avoid world readable access. That avoids exposing files to other users that may be private, and also allows tracking space usage more clearly for each{{UID_}}, so that a user's data can be purged more quickly if they are exceeding their quotas.

Flashback

Recycle bin feature can only recover data for regular files. It can not recover for all metadata changes  especially for empty directories.

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