What Windows notes down about USBWindows logs memory sticks and portable disks as they go in, serial numbers included, and notes how long each stayed plugged in. A stick the machine first met on a Sunday evening, days ahead of a resignation, calls for an explanation.
Sync clients, and webmailWhichever service it was, traces stay on the machine. Google Drive, Dropbox, OneDrive, webmail in a browser tab: the sync database, a cached token, the history, an upload that halted half-done. Signing out and tidying up shifts hardly any of that.
Wiping tools, and deletion in bulkClearing evidence away tends to leave more of it about, not less. Behind stays the tool's name. Behind stays the hour it ran. And behind stays everything the tool never reached — which is generally the detail that settles it.
The sequence is where the proof liesSingly, each of these turns up with an innocent explanation already attached to it. Line them up against a clock, though — folder assembled, stick inserted, upload finished, wiper started — and coincidence is no longer the obvious reading.