Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Everyone is saying to avoid flash memory. It doesn't store well.
Another suggestion given is M-Disc, which might be a better option because then anyone should be able to throw it in a CD drive and load it without having to worry about the format of the drive and things like that. And even if CDs are not that common anymore, I think people will still know what they are and be able to find a way to load it even in 50 years. Like if someone found a cassette tape today (I know they were common much less than 50 years ago, but it's hard to find an example since records came back into fashion). Plus M-Discs are designed for long term storage, so I could worry less about bitrot and files getting corrupt etc. They are write once so I'm not going to write over existing content.
Yeah, flash memory doesn't store well, hence the recommendation to keep checking on it. This article claims 10 years, but I think checking on it every year or two is a good idea.
And yeah, M-Disk looks like a good option, especially if you never need to read from it. I would make multiple copies though, because disks break, get lost, etc. And get an extra drive so your successors don't need to go find one; people are lazy and you want as few obstacles to them using it as possible.
I personally don't like using optical media because players can be finicky and storage can be annoying. But it's probably a good solution for your stated needs.
Seems the only M-Disc capable writer I can find locally is a portable USB-C connecting one, so if I go with it I'll probably just store it with the discs. In theory M-Disc is supposed to be resistant to the kinds of things that destroy regular CDs, but making a second copy does sound like a good idea. I could even store the second copy somewhere else (another house) to protect against fire. I have cloud backup but you never know what's going to happen over 50 years. Or if I die in the fire and no one knows I have the cloud backup.