What kind of, if I may ask?
I was using v1.4.4 for one year, and then updated the IP.
Other solution is to backup it, all files and db, drop most of the tables (invoices tables, preserve clients, quotes, settings, users...) and then start all over again.
If some inspection comes, show them on local server past year, and on live server current year.
To be hones, I dont like second solution
Edit: as I can see in db, unique ID in ip_invoices is not invoice_number column it is invoice_id