Lol at Svejk, telling someone off for bad manners!
I love the irony!
I use t'interweb for banking and shopping but a very good point is made by OG and others who prefer not to ie ledgers do not crash.
And OG's point about his preferred method being simple and foolproof is one that banks should respect.
In reply to PP's query about tallies, the marks on sticks and knots in yarn that represented accounts, these died out in government usage as literacy spread. So say by the 1500s in England. But the system was still used informally in pubs and shops for customer credit, and 'the tally man' was a well known figure up to about 1910-1914, selling goods on credit door to door.