I found a way on a video, to print by selecting invoices..

https://www.teachucomp.com/batch-print-forms-in-quickbooks-online-tutorial/

Should I do that for a whole month or more?

Do nobody make a copy of a whole invoice details OUT of Quickbook, on pdf for backup?

What happens when you close the service..? oh.. 'have the cow tied, so you don't to lose it and continue milking it' nice.. ts