It happens more often than you’d think. During an office move, a server-room cleanout, or an acquisition, someone finds a box of old backup tapes. Nobody remembers exactly what’s on them, the backup server that wrote them was retired years ago, and now someone has to decide whether to keep them, restore them, or destroy them.

Before you do any of that, you need to know what’s actually on those tapes. Here’s how to find out safely.

Step 1: Don’t just put them in a drive

It’s tempting to find any compatible tape drive and try to read them. But old tapes are fragile, and a quick test can do real damage:

  • Aged tape can stick, stretch, or snap. Tapes stored for years, especially in warm or humid places, can suffer from “sticky-shed syndrome”, where the binder holding the magnetic layer breaks down. Running them can shed material onto the drive heads or tear the tape.
  • A dirty or worn drive can damage the media. A drive that hasn’t been maintained can scratch or crease the tape on the first pass.
  • The wrong software can overwrite data. Some backup programs offer to “initialize,” “label,” or “erase” tapes they don’t recognize. One wrong click can wipe the beginning of the tape, including the headers that describe what’s on it.

If the data could matter, don’t run any tape until you know its format and condition.

Step 2: Identify the tape format

The cartridge itself usually tells you what it is. Look for the format name or logo on the label or the shell:

  • LTO (Ultrium). The most common business format. The barcode label usually ends in the generation, for example L5 for LTO-5 or L8 for LTO-8. Newer LTO drives can usually only read one or two generations back, so an LTO-3 tape won’t work in a modern LTO-9 drive.
  • DLT / SDLT. Larger, square-ish cartridges common in servers from the late 1990s and 2000s.
  • DAT / DDS. Small cartridges about the size of an audio cassette, often used by small businesses.
  • AIT, QIC, Travan, and others. Older or less common formats that can be hard to find working drives for today.
  • Open reels (9-track). Large reels from mainframe and minicomputer systems.

Step 3: Take an inventory before anything else

Before moving or shipping anything, write down what you have:

  • Barcodes, handwritten labels, dates, and server or job names on each tape
  • How the tapes were grouped or boxed, since a single backup often spans several tapes, and they need to stay together as a set
  • Where and how they were stored (a climate-controlled room, a hot storage unit, a damp basement)
  • Any related paperwork: backup logs, rotation schedules, or old IT documentation

Labels like “FULL – FRIDAY” or “EXCH01 MONTHLY” can tell you a lot about what a tape contains and which ones matter most.

Step 4: Work out which backup software wrote them

This is the part most people don’t expect. Business backup tapes usually aren’t written as plain files. They’re written in the proprietary format of whatever backup software was used, such as Veritas Backup Exec, NetBackup, ARCserve, EMC NetWorker, Commvault, IBM Tivoli/Spectrum Protect, or Unix tools like tar.

That software normally keeps a catalog, a database on the backup server that records which files are on which tape. When the server is gone, so is the catalog. Without it, the tapes have to be scanned and read directly to rebuild a list of what’s on them. This is possible, but it takes the right software, the right drive, and time.

Also check whether the backups were encrypted. Many LTO systems support hardware encryption. If they were encrypted and the keys are lost, the data may not be recoverable, so it’s worth searching old documentation for key information early.

Step 5: Get a file list before committing to a full restore

You usually don’t need to restore every tape to decide what to do with them. The practical first step is to have the tapes read and indexed, so you get a list of the files, folders, dates, and systems on each one. With that list you can:

  • Restore only the data you actually need
  • Confirm whether the tapes contain records you’re required to keep, such as financial, legal, HR or medical records
  • Safely and confidently destroy tapes that don’t contain anything of value

At Disklab, this is how tape recovery works: we evaluate your tapes for free and give you a detailed file list to review, and you only proceed once you’re satisfied with what’s recoverable.

Before you destroy old tapes

Old backup tapes can contain customer data, employee records, and emails. That’s a good reason to handle them carefully, but also a reason not to throw them out blindly. If your business has retention requirements, or if there’s any chance of a legal or audit request, find out what’s on the tapes first. Once they’re gone, so is your answer.

Where to go from here

Once you know what’s on your tapes, you can decide whether to restore specific files or move the whole archive to modern storage. Our data migration service can move legacy tape archives to disk or cloud storage so you’re not dependent on aging media and hard-to-find drives.

Found a box of old tapes? Start a recovery case or call us at 1-844-347-5522. The evaluation is free, and you pay only if we recover your data.

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