Last reviewed 7 May 2026

Applies to

Unity project safety Backup and recovery planning Version-control habits

Difficulty Beginner

Backing up your Unity3D projects

If you only keep one copy of a Unity project, you should assume you will eventually lose work. Projects can break because of disk failure, bad imports, broken updates, accidental deletions, corrupted files, or simple human mistakes.

Backing up your Unity project is not optional. It is part of normal project maintenance.

What A Good Backup Protects You From

Backups help when:

• a package import breaks the project
• you overwrite a working scene with a bad version
• Unity crashes during a save
• your storage drive fails
• a collaborator deletes something important
• you need to roll back to a known good state

Without backups, even a small mistake can cost hours or days.

The Best Backup Approach

The most reliable setup is usually a combination of:

• version control for ongoing changes
• manual backup copies before major risky work
• cloud or external drive storage for recovery if your main machine fails
• occasional restore tests so you know the backup can actually open

Using only one method is better than nothing, but combining them is much safer.

Version Control Is The Best Day-To-Day Safety Net

If possible, use version control for active projects.

It helps you:

• track what changed
• roll back broken edits
• compare file history
• collaborate more safely

Even if you are working alone, version control is still worth using because Unity projects change constantly.

For Unity projects, version control should include the files that define the project and exclude generated folders that Unity can rebuild. A beginner-friendly starting point is:

Keep	Usually Exclude
Assets	Library
Packages	Temp
ProjectSettings	obj
important documentation or setup notes	Logs
custom local packages you intentionally own	Build / Builds

The exact ignore file can vary by team, but the principle is simple: preserve source content and project configuration, not Unity's regenerated cache.

Manual Backups Still Matter

Version control does not replace all backup habits.

Before major actions such as:

• importing a huge asset pack
• upgrading Unity
• switching render pipelines
• changing project-wide materials
• deleting large sets of content
• rebaking lighting or replacing scene prefabs
• converting a VRChat project between SDK/package states

make a full backup copy first.

That gives you a fast recovery point if the change goes badly.

What You Should Preserve

For a Unity project, the most important data is usually:

• Assets
• Packages
• ProjectSettings

Those contain the actual content and project configuration.

Other folders can often be regenerated, but these are the critical ones you should never risk losing.

What You Can Usually Regenerate

Unity creates several folders while importing, building, logging, and caching project data. These can become large and noisy:

• Library
• Temp
• obj
• Logs
• Build
• Builds
• editor/user-specific settings, depending on the project

Do not delete these casually from your working project while Unity is open. But for backups and version control, understand that they are usually not the primary reference. Unity can regenerate the Library folder from the project content and settings, although the first reopen may take time.

Backup Levels

Different moments need different levels of safety:

Situation	Backup Level
Normal daily work	Commit or sync small changes regularly.
Before importing a big asset	Make a full folder copy or branch first.
Before changing Unity/SDK/packages	Make a full project backup and note the old versions.
Before deleting or moving many files	Commit/backup first, then make the change in one clear step.
Before sharing with another creator	Test the backup on a clean copy or another machine if possible.

Good Backup Habits

Back up before risky imports

If you are about to bring in a big package, world pack, or unknown tool, make a copy first.

Keep more than one recovery point

Do not rely on a single backup from months ago. Multiple restore points are safer.

Store backups somewhere else

If your only backup is on the same drive as the original project, that is not much protection against hardware failure.

Name backups clearly

Use names that tell you what the backup is and when it was made.

Examples:

• WorldProject_PreURPConversion_2026-04-21
• GalleryBackup_BeforeAssetImport
• AvatarProject_BeforeSDKUpdate_2026-05-07

Keep a short backup note

A tiny text note beside the backup can save future-you a lot of guessing. Record:

• Unity version
• VRChat SDK or Creator Companion package versions
• what changed next
• whether the backup has been tested

Common Backup Mistakes

Only backing up after something already broke

At that point, it is too late.

Keeping one huge outdated backup

One old copy is better than nothing, but it may not help if recent work matters.

Backing up the wrong folders

If the important project content is not included, the backup may be useless.

Trusting autosave alone

Autosave is not a real backup strategy.

Never testing a restore

A backup that has never been opened is only a hope. Make a temporary copy, open it in the correct Unity version, and confirm the main scene loads before relying on it.

Recommended Workflow

Use version control for ongoing work, make manual backups before major changes, and keep at least one backup copy off your main machine or drive. That combination gives you both history and recovery options.

The best backup is the one that already exists before you need it.

Restore Test Checklist

Before calling a backup reliable:

• Copy the backup to a temporary location.
• Open it with the intended Unity version.
• Let Unity rebuild generated folders if needed.
• Open the main scene.
• Confirm package errors are not blocking the project.
• Check one important prefab, material, script, or scene reference.
• For VRChat projects, open the SDK panel or Creator Companion project state and confirm packages make sense.

Helpful follow-up pages

• Creating a new Unity Project
• The project has invalid dependencies error
• Unity Error: Failed to load window layout
• Package Manager Basics
• Unity3D Version Differences
• Setting Up VRChat Creator Companion
• Creator Companion Troubleshooting Guide
• Common Unity3D mistakes by beginners

Help! My backup is huge.

Check whether the backup includes generated folders such as Library, Temp, obj, logs, and builds. Full emergency copies can include everything, but version control and routine backups should focus on source project files.

Help! I am afraid to break the project.

Make a full backup or work in a copied project folder first. Setup and repair steps are much less stressful when the original project is untouched.

Help! I only have Assets, Packages, and ProjectSettings.

That can still be enough for a healthy Unity project. Open the folder with the correct Unity version and let Unity regenerate the missing cache folders, then check the main scene and package state.

References

• Unity Importing Assets
• Unity Version Control Ignore Files

Related Navigation

• Unity3D Documentation
• Unity Troubleshooting
• VRChat Documentation