COST: And how much will it cost you to use BD-R discs for backup? MUCH more expensive than your average USB that's for sure, you also have to invest on a Blu-ray burner and on players that actually read that data.
$1.50 for 25GB. I'm pretty sure that is at least 10 - 15x cheaper than a USB drive.
Not to mention, BD-R discs can last ~25 years in storage whereas a USB drive <10. Archival grade DVDs/BD-Rs can last 200+ years.
RELIABILITY/FLEXIBILITY/SECURITY: Using blu-ray as backup is a poor excuse today. There are literally thousands of online file sharing sites/cloud services that provide greater flexibility, security and durability. These services offer REAL backup measures superior to what any average consumer can come up with: such as fireproof rooms, rooms built to withstand natural disasters, anti-theft security, mirrored file servers etc. etc. You honestly think you can keep a more reliable backup on a blu-ray than companies that have invested millions of dollars to ensure such reliability for consumers?
Where as you going to get 25GB for $2.50? Online file sharing is OK for small documents, but still not practical for 100GBs of home movies and photos.
MOBILITY & DURABILITY: Consumes much larger physical space and is more prone to scratches and damage that could potentially render all that precious data you backed up useless. USBs are far lighter, carry more space, are flexible in deleting/adding files and consume less physical space than your average candy and the internals are not exposed to damage from scratches.
Optical media is fine for light use ... I have never scratched a disc before, so I don't know what the worry is?
USB connectors can break ... Flash memory can fail. Same thing.
Your arguments have some merit, but overall quite weak. Until online storage is pennies a GB and everyone has 100mbit+ upload links, I don't think online file storage is entirely feasible.
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