I've been using a pair of drives for my backups for a few years now. One is a Seagate 2TB HDD, which I use for manual file backups every few weeks; the other is a Sandisk 1TB SSD which I use for Time Machine backups for my Macbook (which, yes, is up to date). I do store a copy of my manual backups on my brother's main external drive, though that's only updated every few months when he's in town.

Basically this all lacks redundancy and I want a new external drive. Not looking to spend a ton, say around $100 but that's flexible for the right device. I'd like 2-4TB, the more the better but that's the most I expect to get on a budget. Any and all recs welcome, and general advice here too. I have a couple other questions as well:

- I've heard that SSDs require being powered on a regular basis to not lose data/become corrupted (something about charge levels being part of data storage?).…