Western digital's portable external hard drives are pretty good, up to 5TB and not too pricey. You can carry them around in your pocket. They have the "my passport" line, and the SanDisk "G" drives, which are more ruggedized and moisture resistant. Seems they come formatted for Mac, but if you use Windoze or Linux it's easy to reformat them. They have SSD's too, but more expensive.
I have a few of those WD My Passport drives (4TB model). They are good for backups and reasonably fast. I like that they are small so can fit within a fire/flood safe, and don't require an external power supply, so doing a backup is just plugging the USB in, running the backup, then unplugging.
Yep, and once you unplug them you have cold storage of your backup, not susceptible to attack via any network.
Also protection from power surges or lightning strikes (the 99% of the time they aren't connected to the computer).
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