TerraSin
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Cloud - Quite possibly the greatest method for backing up data we have these days and I'm surprised no one has mentioned it. If you use a company that is reliable and secure, there is no reason why it shouldn't be used as a third backup option. If you're a MS Office 365 subscriber, you get unlimited data storage on OneDrive. Let that sink in for a moment... I pay $10.59/mo for Office and get unlimited cloud storage on MS servers. It won't be long now before other companies follow suit. Don't feel secure? Encrypt it. Very simple to make an encrypted container, load it full of whatever you're backing up and upload the container to the cloud.
Just some food for thought. :)
I've thought a bit about Cloud storage and agree that data should be encrypted if you go that way.
The problem with that, for me at least, is that this is probably the slowest method of all.
I can download, maybe, 5MBps at a sustained clip. For terabytes of data, this is not so feasible. Uploading is much, much slower, so I'd need some sort of continuous backup to cloud for this to work, and I don't want anything like that running on my machine.
Ideally, I'd like to restore stuff in minutes, not days.
Then you'd need a tool to decrypt on-the-fly or you need to download the encrypted file and then decrypt which would require twice the data size and who know how much more time?
A lot depends on the size of the data pool we are talking about.
I tend to prefer partitioning my data sets on various drive volumes and backing up by volume. These volumes are typically 100 GB or more in size. The smallest volume is the OS/Boot data which is about 60 GB compressed. I can back this up and verify to a USB drive in about 15 minutes and restore via boot tools (Acronis on flash using YUMI) in about 10 minutes.
Also, when we use the term 'archive' - how long is the archival duration? If this is US Census data or something that doesn't change, perhaps forever is the answer.
But if this is program data (which can change weekly, monthly, quarterly, or yearly via updates) or sample data (which tend to grow and change a bit more slowly) I think we only need to backup monthly, quarterly, or yearly.
Having a grandfathering policy of rotating the backup devices allows as many previous versions as we want. Since my OS backups are fast, I can eliminate restore points to reduce its size and backup the OS every week. It's quicker to restore an older version than debug a newly appearing problem.
Fast backup/restore speed and monolithic storage media (eg, not multiple devices for a single backup set) are key to having a good backup/maintenence process.
Most storage devices we have now probably will last 5-10 years. This is fine for what most of us need for audio work. Every 5 years or so we go through some radical upheavals in technology anyway.
In the past I used Omega Zip drives, SCSI DAT drives, 256-channel bulk tape cartridges - all now obsolete. I think CDs/DVDs are the next to go. My bets are on magnetic rotation hard drives and solid state memories for the next 5 years.