[docs] backup manager docs

docs/user/accounts/docs.user.accounts.payments.md

@@ -10,6 +10,17 @@ Payments made against Sales Invoices or Purchase Invoices can be made by clickin
 1. Enter the cheque number, cheque date.
 1. Save and Submit.
 
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 Payments can also be made independent of invoices by creating a new Journal Voucher and selecting the type of payment.
 
 #### Incoming Payment