http://oi45tmbel5syg4uet4t2fg6ipfu22ewfb4dfgpeckarn3qtv3pwq.b32.i2p/tips.html
None of that would protect you from me, though. What you can do: you could script your uploads and downloads to run at random times, although you run a small risk that the file you're trying to fetch, or the directory you're trying to write to, will have been renamed or deleted by the time your task runs.