As a life long bookkeeper/accounting person, I can tell you that you MUST have receipts for any expense reports you turn in to your employer.
You also MUST have receipts for anything you deduct on your tax return.
IF you don’t get a paper bank statement & you need to have a printed version older than 3 or 6 months-—you won’t be able to get it.
This idea flies in the face of mandatory PROOF of payment for items you must prove you made.
As for keeping records-—I have my tax records back to 1963. They are in ‘bankers boxes’ & I am pretty sure I have no more than 9 of them with those boxes with records inside. I use a 2-3” three ring notebook for my records, and keep all credit card statements-—WITH THE receipts—and all bills I pay in those notebooks. Indexes for each month, and I get a printed bank statement. I DO NOT do ANY banking online, nor do I purchases items on the internet. I write checks & mail them out. The notebook keeps everything neat & handy if I have to pull something out from the past.
I have been a self employed bookkeeper since 1980, and I used that notebook process for their records , also. In a couple of cases, I had to use 2 notebooks a year, but their storage of their activity is easy & neat. No file folders-—everything 3 hole punched & into the notebook.
When you pay with your phone,the vendor ap provides and keeps the receipt for ever
I keep all paper books also.