You: NextCloud, ownCloud, SyncThing
Me, an intellectual: rsync
> [if you rely on a USB backup] Get ready to lose a bunch of files when the flash chip suddenly dies on you.
Yeah, that's something I worry about. I only have the gpg key for my YubiKey backed up via USB. I have copies on *four* USB drives, which gives some redundancy but hardware failure still seems like a potential issue.
I'm only missing three things required for that plan:
- a way to write optical disks,
- a way to *read* optical disks, and
- optical disks
> Optical disks aren't reliable either.
Just keep the data themselves replicated on multiple hot storages, symmetrically encrypted, and the key on a laminated piece of paper.
Yeah, agreed that that is Best Practice™
Personally, I haven't done so – largely because my "key" is actually a master key & three sub-keys, so paper copies are even more cumbersome. (I basically have this setup: https://github.com/drduh/YubiKey-Guide/blob/master/README.md
PaperKey is good for backing up GPG keys: https://www.jabberwocky.com/software/paperkey/ it’s included in Tails too.
As for backups it’s good to have multiple tokens from different batches or vendors, to avoid all of them failing at the same time :)
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