How to Decide Whether a Scratch Drive Needs Its Own Backup
A scratch drive can hold disposable cache data, irreplaceable project files, or both. I’ll help you separate those roles, weigh backup cost against recovery time, and choose storage protection that fits your creative workflow.
Creative applications often call several different things “scratch” space: render caches, previews, proxy media, autosave files, working footage, sample libraries, and the project files that tell everything else how to fit together. Treating all of it as disposable can make recovery painful; backing up every byte can waste money and time.
The right question isn’t simply how large the drive is or whether it contains temporary files. It’s whether losing a particular file would force you to recreate work, interrupt a deadline, or accept a result you can’t reproduce. Once you separate those consequences, the backup decision becomes much clearer.
Start by separating data by recoverability
A genuinely disposable scratch file can be recreated from files you still have. Examples include a video render that can be exported again, a shader cache generated by an application, an image editor’s temporary preview, or local proxy files that can be rebuilt from original media. If recreating it takes only time and compute resources—and you have both available—its own backup may not be worthwhile.
That last qualification matters. A cache might be technically reproducible but still expensive to regenerate. Re-rendering a long sequence can occupy a workstation for hours or days. Rebuilding a simulation may require a specific application version, plug-in, license, asset, or configuration that you no longer have. A file isn't meaningfully disposable if recreating it is uncertain or would jeopardize a deadline.
Your active project files deserve a different classification. A video editing project, 3D scene, audio session, compositing file, design document, or code project may be relatively small compared with its media, but it often contains the decisions that would take the longest to reconstruct. Losing it can turn an intact folder of source footage into an unusable pile of material.
The same applies to project-specific settings and supporting data. Consider custom presets, LUTs, font files, plug-in configurations, simulation caches that can't be reproduced exactly, marker data, metadata, and scripts. They may sit on a drive labeled “scratch,” yet they can be the difference between reopening a project and starting over.
A useful test is to ask: If this file vanished today, could I recreate the same result from the data stored somewhere else? If the answer is “yes, but it would take a long time,” it belongs in a recovery plan even if you choose not to back up every generated version. If the answer is “not exactly,” it should be treated as important data.
Check the rebuild path: Open a representative project or review its application settings, then identify every source, project file, preset, plug-in, and cache required to recreate the result. Don’t assume a folder is disposable until you know what the application can actually regenerate.
Decide what “backup” needs to accomplish
There are several levels of protection, and they don’t all require a complete duplicate of the scratch drive.
The simplest approach is to back up only irreplaceable material: project files, source assets, custom settings, and any generated data that would be impractical to reproduce. This is often the best balance for creative work. It protects the decisions and inputs while allowing you to regenerate large temporary outputs when necessary.
A second approach is to back up the entire drive, including caches and previews. That can shorten recovery time because you can resume work without rebuilding everything. It also preserves the state of a project at a particular point, which may matter when an application update, plug-in change, or revised source file makes a later rebuild different.
Full-drive protection costs more in storage and may take longer to copy. It can also preserve a great deal of data with little long-term value. If the drive is constantly changing, a backup system may spend much of its time copying temporary files that are deleted and recreated anyway. Excluding known cache locations can make protection faster and easier to manage, provided important files aren’t stored there too.
A third option is to use a separate working copy rather than a conventional backup. For example, you might keep an active project on the scratch drive and a second copy of the project directory on a desktop drive or network storage. This helps with drive failure, but it may not protect against accidental deletion, corrupted files, ransomware, theft, or a mistake that gets synchronized everywhere.
That’s why a second copy should support—not replace—a real backup history. Versioned backups or snapshots can let you recover a project from before an accidental overwrite. For files that change frequently, this protection is usually more valuable than repeatedly creating a fresh manual copy with the same filename.
Match protection to the drive’s role
If the drive contains only reproducible caches, you may reasonably choose no dedicated backup. Instead, document where the cache lives, make sure the application can recreate it, and keep the original inputs and project files protected elsewhere. You’ll still need a plan for replacing the drive, but that plan may be as simple as installing a new drive and allowing the software to rebuild its workspace.
If the drive contains active projects alongside caches, configure protection around the important directories rather than relying on the drive’s label. Store project files in a clearly named location, separate from application-generated temporary folders when possible. That makes selective backup practical and reduces the chance that a future application setting places valuable data in an excluded directory.
If the drive holds unique source media or generated results that can't be recreated, give it the same backup priority as any other primary data drive. A scratch designation doesn’t reduce the value of the files. The drive may be fast and replaceable, but the footage, recordings, scans, or completed work on it may not be.
The risk is higher when the scratch drive is also the only place where work exists. A fast internal SSD can seem like a temporary workspace, but if you import camera cards directly to it and erase the cards immediately, it has become the primary copy. Similarly, if a project begins on an external drive and never gets copied elsewhere, the intended workflow no longer matters; the actual storage arrangement does.
Consider recovery time, not just data loss
Backup decisions are often framed as capacity calculations: how many terabytes will protection require? Recovery time can be the more important constraint. A small project file may be easy to restore, while rebuilding a large cache could delay delivery. Conversely, copying many terabytes of temporary media may consume storage and bandwidth without protecting anything irreplaceable.
Ask what you need to do after replacing or losing the scratch drive. If the answer is “restore the project and continue immediately,” include the files and settings that make that possible. If the answer is “reinstall the application, reconnect the originals, and let it rebuild previews overnight,” a selective backup may be sufficient.
You can also protect recovery speed without preserving every generated file. Keep a current copy of project files and essential assets, record application and plug-in versions, export lightweight reference files when useful, and retain a small set of representative outputs. For complex work, a short text file describing folder locations, external dependencies, and unusual settings can save more time than another copy of a cache.
Don’t confuse redundancy with backup
A RAID array, mirrored drive, or second internal SSD can reduce downtime when one device fails, depending on its design and maintenance. It doesn’t automatically provide historical recovery. If a file is deleted or corrupted, the bad change may be reflected across the redundant storage at once.
Cloud synchronization has a similar limitation. It can provide useful off-device access and, in some services, version history. But synchronization alone may replicate deletion, depend on an available internet connection, or leave files in an online-only state when you need them quickly. Check what history, retention, and offline-access features your chosen service actually provides rather than assuming “in the cloud” means fully backed up.
A sensible arrangement often combines local and off-device protection. Keep the active work on fast storage, maintain a separate local copy for quick recovery, and place a versioned or otherwise independent copy away from the workstation. The exact devices and services depend on the scale of your work, but the principle is consistent: one failure or mistake shouldn’t remove every copy.
Confirm your recovery coverage: Look at the backup job or sync rule and verify that it includes project files, source media, presets, and other non-reproducible data while excluding only folders you have tested as safely rebuildable. Then check that an older file version can actually be restored.
A practical decision for mixed-use scratch drives
For most creative workflows, the strongest compromise is selective backup with clear storage boundaries. Back up project files continuously or frequently, protect original media and unique assets separately, and include settings or generated files when recreating them would be uncertain or disruptive. Exclude caches only after confirming that the application can rebuild them from protected inputs.
If a deadline, client requirement, or unusually long render makes downtime costly, preserving more of the scratch drive can be justified. You’re paying for faster recovery rather than merely preventing permanent loss. On the other hand, if storage is limited and the drive contains terabytes of routine previews, full duplication may obscure the files that matter most.
Review the arrangement whenever your workflow changes. A new application, plug-in, camera format, project type, or folder convention can change what is reproducible. Test the process by restoring a project to another location and opening it there. A backup that exists but can't produce a usable working project is only partial protection.
In the end, a scratch drive needs its own backup when it holds data that can't be recreated reliably, or when rebuilding its contents would cost more time than your work can tolerate. Protect the decisions, inputs, and dependencies first. Add full-drive recovery when rapid continuity is worth the extra storage, and keep disposable caches disposable only when you’ve proved they really are.