Fifty terabytes is the inflection point where casual storage advice stops working. Below it, you can throw money at any cloud provider and not feel it. Above it, the choice between Backblaze B2, AWS Glacier, LTO tape, and a shelf of cold hard drives starts mattering by thousands of dollars.
The honest answer is that there is no single winner. There's a winner per scenario, and a hybrid that beats most pure-play options once you actually need to pull a file back. Here is the side-by-side and the workflow that wins.
The 5-Year TCO, Side by Side
Cost-of-ownership math for 50 TB held for five years, with one full retrieval at year five (because what's the point of an archive you never read?):
| Storage option | Year 1 | 5-year storage | Full retrieval cost | 5-year total |
|---|---|---|---|---|
| Backblaze B2 | $4,170 | $20,850 | $0 (free egress up to 3x storage) | $20,850 |
| AWS Glacier Deep Archive | $720 | $3,600 | ~$4,500 | $8,100 |
| LTO-9 (DIY) | $5,200 | $5,200 | $0 (you own the drive) | $5,200 |
| Cold external HDDs | $4,500 | $4,500 (replace 1 in year 5) | $0 | $5,200 |
| Synology NAS in another building | $7,500 | $7,500 (drives + chassis) | $0 | $7,500 |
A few things jump out. Backblaze B2 is the most expensive option by a wide margin, but it's also the only one where the files are accessible in seconds, no ceremony required. Glacier is dirt cheap until you actually want your files back. LTO-9 is the lowest TCO but you're now in the tape-management business.
Backblaze B2: When Speed Matters
B2 sits at $6.95/TB/month as of mid-2026 (it dropped from $5 to $6 to $6.95 over the last two years; egress is generous up to three times your stored volume per month).
For 50 TB, that's $347/month or about $4,170/year. Five years of storage runs $20,850.
The reason anyone pays this is that you don't pay extra to retrieve. A producer calls Tuesday wanting a 200 GB sub-pull from a 2024 commercial, and you're handing them the files by lunch. With Glacier you'd be waiting 12+ hours and budgeting hundreds of dollars in retrieval fees.
B2 wins when retrieval frequency is monthly or higher.
AWS Glacier Deep Archive: When Retrieval Is Theoretical
Glacier Deep Archive is $0.00099/GB/month, or about $0.99/TB/month. For 50 TB that's roughly $50/month, or $600/year. Five years runs $3,000 to $3,600 with API and request overhead.
The catch is the retrieval bill. Standard retrieval (12-hour delivery) runs about $0.02/GB plus per-request fees. Pulling all 50 TB in a single restore window is in the $4,500 to $5,000 range. Egress to internet is another $0.09/GB after the first GB free, so add another $4,500 if you're hauling all of it back to your own network.
Glacier is insurance, not an archive you'd ever actually read. Think of it like a salt-mine vault: cheap to keep, expensive to retrieve, but you sleep at night.
Glacier wins when retrieval frequency is "essentially never, but I'd want it back if the building burned."
LTO-9: When You Own the Workflow
LTO-9 holds 18 TB native per tape. For 50 TB you need three tapes (and you should buy four for redundancy). At $80/tape that's $320. Add an HBA-based LTO-9 drive at $4,000 to $5,000 and you're around $4,500 to $5,500 all in.
After year one, the cost is essentially zero. Tape doesn't accrue monthly bills. You toss the cartridges in a fireproof safe and walk away.
There are real costs that the spreadsheet doesn't show. You have to physically maintain the drive. Heads need cleaning. Tapes degrade after 30 years (that's actually fine for most workflows, but it's a real number). Most importantly, you need to budget time to do tape verification once a quarter or you'll discover the bad block at the worst possible moment, like every editor who's ever opened a backup tape from 2018 only to find half of it unreadable.
LTO wins when retrieval frequency is yearly or less, and when you're committed to the tape lifecycle.
Cold External HDDs: The Bargain Trap
Three 20 TB external HDDs (Seagate or WD) run about $1,500. Two copies for redundancy is $3,000. Add a small drive shelf or rotating external dock, call it $4,500.
This works. Editors have been doing it for two decades. The risks are real but manageable: bit rot eats files slowly over years, drives sitting on a shelf can fail to spin up, and a dropped drive is a dead drive.
The pattern that holds up is: two complete copies, kept in two separate buildings, refreshed every five years. That refresh cycle is non-negotiable. HDDs that sit unpowered for 5+ years have a meaningful failure rate on first power-up.
Cold HDDs win for sub-100 TB, mid-tier retrieval needs, and anyone who hates ceremony.
The Hybrid That Actually Wins
Here is what the smart money does at 50 TB:
Tier 1: LTO-9 master. Two complete copies on tape, stored in different buildings. About $5,500 in year one, $0 after. This is the real archive.
Tier 2: 5 TB hot copy on B2. The most-likely-needed slice (recent finals, key sequences, high-value source) lives on B2 for fast pull. About $35/month, or $2,100 over five years.
Total 5-year TCO: roughly $7,600 for a setup that gives you instant access to the files you'll actually want, and a deep archive for everything else.
This is significantly cheaper than B2 alone ($20,850) and gives you better retrieval ergonomics than LTO alone (no tape mount for the most likely pull).
The calculator lets you model your specific volume against current pricing for each provider.
The Hidden Cost Nobody Plans For
There is one cost that doesn't show up on any vendor's pricing page: the cost of backing up files you didn't need to back up.
Most editors archive 30 to 60 percent more data than they actually need to. Cache files, proxies, render previews, transcodes, and the imported media that never made it onto a timeline. On a 50 TB archive, that could be 15 to 30 TB of dead weight.
At B2 prices, 20 TB of waste is $1,668/year. Over five years that's $8,340 wasted on storing nothing. On LTO it's an extra tape and an hour of write time, which is small but real.
Clip Sweeper was built to find that dead weight. It scans your Premiere project files, walks the actual edit references, and tells you what's used and what was imported and forgotten. Stripping unused source before you commit to an archive plan can cut your storage bill by a third without losing a single file you'd actually want back.
The cheapest 50 TB backup is the one where you're only backing up 35 TB.