In the era of cloud and SSDs, many consider LTO tape outdated. It’s quite the opposite: tape backup is experiencing a resurgence, driven by the fight against ransomware and the unbeatable cost of long-term archiving. This guide explains what LTO is, why it remains relevant in business, and how to integrate it into a real backup strategy.
What is LTO technology?
LTO (Linear Tape-Open) is an open standard for magnetic tape storage, designed for backup and archiving. Data is written onto a cartridge inserted into a tape drive. It is an economical, durable medium that is easy to store offline.
LTO generations and their capacities
Each generation roughly doubles the capacity of the previous one (native capacities, excluding compression):
- LTO-6: 2.5 TB
- LTO-7: 6 TB
- LTO-8: 12 TB
- LTO-9: 18 TB
The advertised “compressed” capacity is about 2.5× higher depending on the data. A drive typically reads the previous generation and writes to the generation before that, ensuring some compatibility.
Why tape remains relevant
- Unbeatable cost per TB: for large archived volumes, tape costs much less than disk or cloud over time.
- Longevity: a cartridge can last several decades, ideal for legal archiving.
- Air gap (physical disconnection): an ejected and stored tape is offline, thus inaccessible to ransomware. This is today’s number one argument.
- Low power consumption: stored tape consumes no energy, unlike online disks.
The 3-2-1 backup rule
The best practice: 3 copies of your data, on 2 different media, with 1 offsite. LTO perfectly serves as the offline/offsite copy, complementing disk or storage arrays for fast restores.
LTO, disk, or cloud: when to choose what?
Disk (NAS, arrays) is unbeatable for quick restores. Cloud is convenient but becomes costly for large volumes kept long-term and remains connected. Tape excels at massive archiving and offline ransomware-proof copies. Most companies combine disk (fast) + tape (secure, long-term).
Tape drive, autoloader, or library?
A simple drive is enough to back up one cartridge at a time. An autoloader or library holds multiple cartridges and automates rotation—useful as volume or frequency increases. Some tapes come in WORM (write once, read many) versions for compliance and tamper-proofing.
Used LTO equipment
Tested used drives and autoloaders greatly reduce the entry cost for tape backup. Each device is inspected and guaranteed. Discover our LTO drives and tapes, to pair with your servers. For online storage, also see our guide HDD, SSD, SAS, SATA.
FAQ: LTO backup
Is LTO outdated?
No. Tape remains the most economical medium for massive archiving and offline copies, and it is highly favored for ransomware protection thanks to the air gap.
Does tape really protect against ransomware?
An ejected and stored cartridge is no longer connected to the system: malware cannot encrypt it. This is the major benefit of offline copies.
Which LTO generation should I choose?
Depending on your backup volume and budget: a recent generation offers more capacity per cartridge, but an earlier generation remains very economical for moderate volumes.
Does tape replace disk?
No, it complements it: disk for fast restores, tape for long-term archiving and offline copies. Both are complementary in a 3-2-1 strategy.
In summary
Far from obsolete, LTO tape backup remains a cornerstone of enterprise archiving: unbeatable cost per TB, longevity, and especially offline copies against ransomware. Integrated into a 3-2-1 strategy alongside disk, it securely preserves your data over time—and tested used equipment significantly lowers the cost.