Upload & Sell: Off
It is still worth giving careful consideration to a standard policy covering your likely situations. Even when you have a policy, you can deviate on a case-by-case basis when appropriate, but without a policy you can run into problems very quickly, depending on what your business is.
Let's say, for instance, you do wedding photography and sell albums. Replacing a folder of individual 4x6 prints may not be much in time or money, but replacing a wedding album probably will be. You need to think about what your standard policy will be--where will you draw the lines and what is the reason that makes business sense to you for drawing those lines.
Then, when the situation arises, you have a ready response...or can decide differently in that case. But at least you know why and what it's going to cost you.
That's why I have a lifetime replacement policy for my wall portraits but not for gift prints. My rationale and calculations are similar to those of an insurance company (which is what a guarantee is). My wall portraits are expensive and replacing one is a serious consideration for a client. Yet, having to replace a wall portrait is a statistically rare circumstance. Thus, I can offer something that would be a great benefit to an individual client who suffered that loss, but it's statistically rare enough not to chew seriously into my own bottom line.
The case is different for gift prints. They're cheap enough not to be a significant burden to my clients, but the statistical odds that they will lose or damage a gift print are extremely high--I'd spend a large amount of time and effort replacing gift prints if I provided the same lifetime guarantee for them.