For legal requirements (as hinted ), save them off-line on write-only media eg DVD.
(no tampering)
Note also that (I believe), none of the popular sites like gmail, yahoo GUARANTEE to not lose stuff; its just a best effort that is usually(!) good enough.
You're hinting at a much more definite requirement ie off-line backups.
Whatever plan you come up with, run it past the client BEFORE implementing it....
|