It is a tricky one. We've got artwork dating back over 12 years and have had occasion to dig out the old Zip Drive.
I would think that there has to be a limit of something like 5 years, then you could possibly offer the artwork to the client for a charge or offer to archive it for a reasonable cost.
In saying that, I don't think we've got a detailed policy on the matter, so I think I'll have to rewrite something on the T&Cs. :icon_smile: