The simplest way is to contact your Salesforce rep and ask them about prices for increasing storage limits.
In my experience, I have seen that the prices vary quite a much based upon your account size and potential.
Another option is to purchase a license for one more user.
You can also consider upgrading your Salesforce instance to a better version, but that usually means investing a lot.
Another option is to create and maintain an external database and connect your Salesforce org to it.
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This reply was modified 9 years, 12 months ago by
SFDCHacker.