At the end of each year, I try to cut down on emails, newsletters and the like. I didn’t say I was successful, just that I try to do it, and have for the past several years. Basically I delete as many old emails as possible and unsubscribe to as many emails/messages as possible. For some messages I do a backup before deletion, for others which I can find via Google search, I just delete them. As I was researching this topic I came across this rather simple, straightforward and helpful article on backing up your Mac[s]. The day will come when your Mac/Device is lost, stolen, breaks, is destroyed - and if you don’t have a backup there is absolutely nothing you can do. For that reason, one end of the year prescription is to Back Up your computer[s]. Then go on with your cleaning!
How to back up your Mac 2020 | iMore