Google Drive's internal search is not good enough when there are 100s of documents with similar titles, so I try to maintain a consistent naming convention "{yyyy-mm-dd} {summary of document}". Electronic documents (e.g. bank and credit card statements) are downloaded as PDF and uploaded to the same Google Drive folder hierarchy.
The originals go into a set of 12 file folders labeled "Jan" to "Dec". The folders become a ring buffer. Every month, I empty out the upcoming month, by shredding the originals from 12 months ago. I got rid of a 4-drawer filing cabinet by incrementally scanning the original paper documents over several weeks.
(Edit: fix typo)