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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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I decided instead to use ZFS. Better protection than just letting something sit there. Your backups are only as good as your restores. So, if you are not testing your restores, those backups may be useless anyway.
ZFS with snapshots, replicated to another ZFS box. The replicated data also stores the snapshots and they are read-only. I have snapshots running every hour.
I have full confidence that my data is safe and recoverable.
With that said, you could always use M-disk.
ZFS even if only one server is much better than most people have. If your ZFS replication is to a different building you have done pretty good. However as others have pointed out there are limits. Those servers costs you a couple bucks/month in electric (where I live my electric is 100% wind, but most of you should read CO2). You have to buy both servers, and hard drives will crash regularly.
There are a lot of trade offs, but cold storage backups are often much cheaper in the long run than the backup zfs server. And those cold backups are a lot easier to put into multiple different locations.
I have automated backups including to cloud, but I want a separated manual system that cannot get erased if I mess something up (accidentally sync a delete, lose encryption key, forget to pay cloud bill). I have 3 2 1 but it's all automated and backups are eventually replaced, if it's not a critical failure I won't necessarily know I've lost something.
Basically, I specifically want cold storage, and not cloud. I will only add, not delete from it. And I don't want it encrypted.
Based on other conversations I'm planning on using duel disks mirrored, zfs, annual updates and disk checks with disks rotated out every 5 years (unless failing/failed). Handling the need for layman retrival of data by including instructions with the hard drives.
I have a client with a photographic studio. To give you an estimate, his data is around 14TB of mostly camera pictures with approximately 20 years or history and the owner believe it or not, relies on multiple external hard drives for cold storage, he has a 2TB Seagate thats like 2011-2012 old which still works.
To put in a cupboard tho, M disc is your best bet.
That sounds like a really good idea. You basically get the best of everything.
The cool thing about ZFS is the pool information is stored on the disks themselves. You can just plug them in and import the pools.