Not only local copies but also at least own and use one device where you have your important data that is not on the same OS ecosystem as the other device(s) - also helps with things like 2FA, password manager, etc., if shit has hit the ceiling fan on the other device.
In addition, I always suggest people to:
- Not use big tech's cloud services - ever
- But if you must, do not use many cloud services from just one provider (i.e no Google everything, no iCloud everything) i.e stop using "one account gateways".
- Needless to say, it's time you had a domain and start paying for mail hosting (at least for critical stuff - you can actually buy a very cheap plan; and use that gmail/live-hotmail/yahoo/iCloud/whatever everywhere else) [0]
- Keep an offline (but safe) copy of your "most" important data [1] and ways to remember (i.e cryptic hints) for your "most" important passwords
- Gain some experience in fighting in consumer courts/forums (depending upon your country) - start early, start with e-com companies. A lot many times we don't put up a fight because we have never done it before and we give up always because every time it's a first time. Apple and Google make a mockery of consumers everywhere because we have allowed them to. In fact sometimes when we talk of lack of accessible support at Google and Apple (yes, Apple) we speak in a disdainful appreciation or awe :)
[0] Some might disagree but disabling (or dev/nulling in a way) mail@, hi@, contact@, sales@ etc on your domain (esp. if you have catch-all enabled) goes a long way in terms of avoiding spam
[1] It's also very important to have a tiered approach to data storage and backup strategies. There should be a very, very, very small subset of your personal data, including some of your photos and videos, that is really, really small in storage footprint that you can back up/sync to multiple locations and actually pay the full price for it at storage costs via your own setup, preferably using FOSS tools (which are becoming too good these days) out there.