Hi,
I’m not sure if this is the right community for my question, but as my daily driver is Linux, it feels somewhat relevant.
I have a lot of data on my backup drives, and recently added 50GB to my already 300GB of storage (I can already hear the comments about how low/high/boring that is). It’s mostly family pictures, videos, and documents since 2004, much of which has already been compressed using self-made bash scripts (so it’s Linux-related ^^).
I have a lot of data that I don’t need regular access to and won’t be changing anymore. I’m looking for a way to archive it securely, separate from my backup but still safe.
My initial thought was to burn it onto DVDs, but that’s quite outdated and DVDs don’t hold much data. Blu-ray discs can store more, but I’m unsure about their longevity. Is there a better option? I’m looking for something immutable, safe, easy to use, and that will stand the test of time.
I read about data crystals, but they seem to be still in the research phase and not available for consumers. What about using old hard drives? Don’t they need to be powered on every few months/years to maintain the magnetic charges?
What do you think? How do you archive data that won’t change and doesn’t need to be very accessible?
Cheers
I would use maybe a Raspberry Pi or old laptop with two drives (preferably different brands/age, HDD or SSD doesn’t really matter) in it using a checksumming filesystem like btrfs or ZFS so that you can do regular scrubs to verify data integrity.
Then, from that device, pull the data from your main system as needed (that way, the main system has no way of breaking into the backup device so won’t be affected by ransomware), and once it’s done, shut it off or even unplug it completely and store it securely, preferably in a metal box to avoid any magnetic fields from interfering with the drives. Plug it in and boot it up every now and then to perform a scrub to validate that the data is all still intact and repair the data as necessary and resilver a drive if one of them fails.
The unfortunate reality is most storage mediums will eventually fade out, so the best way to deal with that is an active system that can check data integrity and correct the files, and rewrite all the data once in a while to make sure the data is fresh and strong.
If you’re really serious about that data, I would opt for both an HDD and an SSD, and have two of those systems at different locations. That way, if something shakes up the HDD and damages the platter, the SSD is probably fine, and if it’s forgotten for a while maybe the SSD’s memory cells will have faded but not the HDD. The strength is in the diversity of the mediums. Maybe burn a Blu-Ray as well just in case, it’ll fade too but hopefully differently than an SSD or an HDD. The more copies, even partial copies, the more likely you can recover the entirety of the data, and you have the checksums to validate which blocks from which medium is correct. (Fun fact, people have been archiving LaserDiscs and repairing them by ripping the same movie from multiple identical discs, as they’re unlikely to fade at exactly the same spots at the same time, so you can merge them all together and cross-reference them and usually get a near perfect rip of it).
an important detail here is to add the 2 disks to the filesystem in a way so that the second one does not extend the capacity, but adds parity. on ZFS, this can be done with a mirror vdev (simplest for this case) or a raidz1 vdev.