So I categorize data by importance.
- is if my original content and I would be miffed by loss
- my original I can lose
- other's content I can lose
- other's content I cannot lose.
Based on this then:
- I keep a "master" copy which is my current regularly working system, usually a laptop. I have a background script I wrote which copies it to two Raspberry Pi type devices, one in my house, one in a family member's house, I use rsync over ssh to a Veracrypt volume, to encrypt in transit and at rest. The total data is small currently about 2GB.
- I have scripts which when one of my 4 portable devices connect will sync the delta. So I have 2 to 6 places my current data is kept. I have these scripts as icons on my portable devices.
- less important data I use just copy using the internal storage in devices, this usually exists in 4 places. These are usually media and usually in the 100GB-200GB region.
- infrequent backups of less important data I copy ad-hoc to different harddrives.
- work related files so not my data, I use their official backup tool so if they lose it is their fault.
I added it up and my data exists into up 9 places, but never less than 3 places.