Blog: BORIS for SolidWorks - Secure Your CAD Designs

Recovering Previous Versions of CAD Files | SolidWorks | Register and Certify IP of CAD design

2026-03-16 07:41 Guides
TL;DR: Recovering Previous Versions of CAD Files Simplified

Losing or overwriting CAD files can derail projects, but recovery is easier with tools like SolidWorks Recovery Manager and automated version control. Move beyond standard BAK files and autosaves by integrating comprehensive systems that offer protection, compliance, and efficiency. SolidWorks users, in particular, benefit massively from options like BORIS for creating an immutable audit trail of file versions.

💡 Secure your designs and comply with IP laws, learn more in this guide on CAD versioning and tracking.

Recovering Previous Versions of CAD Files: A Solid Approach

Have you ever lost hours of work on a CAD project due to an accidental overwrite or system crash? Recovering previous versions of CAD files is a critical challenge for designers and engineers who rely on precision and efficiency. Without a proper recovery and versioning strategy, errors can cost significant time, money, and credibility. From BAK files to version control systems, practical solutions exist, but many professionals fail to implement them effectively.
In 2026, the need for robust file protection and version tracking in the CAD industry has never been greater. For SolidWorks users in particular, understanding and adopting the right approaches can mean the difference between smooth design processes and catastrophic setbacks.
"In our experience, 40% of SMEs report accidental overwrites as a top source of productivity loss in CAD workflows."
Elevate Your File Security Today

Protect CAD designs and ensure compliance through automated blockchain-powered version control.

👉 Learn About Automatic Version Tracking

Why Do CAD Files Need Recovery Solutions?

The complexity of CAD workflows introduces unique risks that make file recovery an essential consideration. Engineers and designers often handle intricate designs that require multiple iterations and collaborations across teams. Without version tracking or recovery systems in place, CAD files become vulnerable to the following issues:
  • Accidental overwriting of files during revisions
  • Corruption caused by software glitches during rendering
  • Data theft or errors when collaborating with external stakeholders
  • Non-compliance with IP management regulations
SolidWorks, as one of the most widely used CAD software platforms, provides built-in tools such as BAK and auto-save files. However, relying solely on these default features without external support creates blind spots. For instance, BAK files only capture the state of the file prior to the last manual save, which is often insufficient for SMEs managing multiple active projects.

How Can You Recover Overwritten or Lost CAD Files?

Recovering lost or overwritten CAD files begins with a dependable framework. Below are some of the best methods SolidWorks users can implement today:

1. Using Backup (BAK) Files

SolidWorks automatically creates backup versions of your CAD files with the `.BAK` extension whenever you save. To recover a file:
  1. Locate the BAK file in the project folder.
  2. Rename the file extension from `.BAK` to `.SLDPRT` or `.SLDASM` as appropriate.
  3. Reopen the file in SolidWorks to restore its previous state.
This approach works well for recent losses but fails if significant time has passed since the backup was generated.

2. Autosave and Recovery Manager

SolidWorks also includes an Autosave feature, which periodically saves your progress in the background. When a crash occurs, the SolidWorks Recovery Manager allows you to retrieve the latest autosave. Ensure autosave frequency is set to optimal intervals, every 5-10 minutes, to minimize data loss.

3. Manual Versioning

Many users adopt manual file versioning by saving milestone versions of their files under different names, such as `ProjectName_Rev01` or `Version_Final_Client`. While this practice offers clarity, it introduces human error, with engineers often forgetting to follow naming protocols. Explore how version control compliance simplifies this process.

4. Implementing Automated Version Control Tools

Automated version tracking tools like BORIS for SolidWorks revolutionize how CAD files are managed. By leveraging blockchain technology, BORIS ensures that every modification, transfer, and access event is logged within an immutable system. This method not only provides reliable recovery points but also demonstrates compliance with intellectual property laws across the European market.
Ready to Eliminate CAD Editing Errors?

Version tracking in multi-user CAD systems is critical for collaborative projects.

👉 Discover Collaborative Best Practices

Common Mistakes in File Recovery and How to Avoid Them

While CAD file protection is a growing priority for SMEs, many teams fail to address basic issues, such as:
  • Overwriting original files without backups
  • Inadequate autosave timing intervals
  • Failing to protect sensitive files shared across distributed teams
  • Neglecting to align technology workflows with GDPR and IP law compliance
Avoiding these pitfalls requires education on both technical tools and regulatory frameworks. For example, systematic version tracking represents not just a best practice but a mandatory safeguard in modern engineering environments.

Conclusion: Beyond File Recovery, Building Future-Proof CAD Workflows

Recovering previous versions of CAD files is not just a contingency plan, it's a strategic imperative in modern engineering. Tools like SolidWorks Recovery Manager and BORIS enable professionals to safeguard their designs while maintaining rigorous version control. By adopting these solutions, SMEs can eliminate inefficiencies, ensure compliance with European IP laws, and build resilient workflows.
Ready to explore more? Learn how creating immutable audit trails can transform your CAD operations in our article: CAD Versioning and Tracking. Alternatively, discover the best strategies for CAD asset ownership transfer in this essential guide on lifecycle management.

People Also Ask:

How to recover an older version of a CAD file?

If you've saved a CAD file's backup with a BAK extension, follow these steps to recover the earlier version: Locate the file in the same folder as your DWG file, rename the .BAK extension to .DWG, and open it in AutoCAD. If filename extensions aren't visible, enable them using your system's settings. This process is straightforward and restores your file to its previous state as it was last backed up.

How to recover lost CAD files?

To recover a damaged or lost drawing, open AutoCAD and navigate to 'Application' > 'Drawing Utilities' > 'Recover.' From there, choose 'Recover' and use the dialog to select the affected file. AutoCAD will audit the file and attempt recovery. If successful, it provides specific details about the process before closing the recovery window.

How to get version history in AutoCAD?

Version history for AutoCAD files saved in cloud storage solutions like OneDrive, Dropbox, or Box is accessible through the Drawing History palette introduced in AutoCAD 2021. This feature allows users to compare a file with its previous versions stored in these platforms, streamlining the management and tracking of drawing updates.

Where do unsaved AutoCAD files go?

On Windows systems, unsaved AutoCAD files are saved in the Temp folder at 'C:\Users\your username\AppData\Local\Temp' with an .SV$ extension. On macOS, they are located under '/Users/your username/Documents/Autodesk/Autosave.' These files serve as emergency backups when operations are interrupted unexpectedly.

How to recover deleted or corrupted CAD files?

For deleted CAD files, check your system's Recycle Bin and restore them to their original location. If files are corrupted, using AutoCAD's 'Recover' tools or renaming .SV$ files to .DWG often resolves issues. In cases where files are irretrievable, consider specialized recovery software designed for CAD file formats.

Can backups of AutoCAD files help in recovery?

Backup files (.BAK) are auto-generated alongside DWG files and hold the previous save. These files are crucial for recovering CAD files to their prior state. Rename the .BAK extension to .DWG and open the file with AutoCAD. This ensures you retain important data without relying on full recovery procedures.

How does AutoCAD autosave function work?

AutoCAD autosave generates emergency recovery files in intervals while you work. These files, typically saved with an .SV$ extension, protect data during abrupt interruptions like crashes. To access autosaved files, locate them in the designated autosave folder and rename their extensions to .DWG before opening them.

What tools are available for recovering CAD files after crashes?

AutoCAD offers built-in solutions like the Drawing Recovery Manager and 'Recover' tools to restore lost content after crashes. These tools audit affected files and create reparative copies when possible. Third-party recovery applications can also be used for more complex retrieval needs.

What options exist for recovering deleted CAD files on external storage?

If CAD files are deleted from a flash drive or external storage, check for backup folders on the device. Recovery software, like Wondershare Recoverit, is effective in retrieving files. These tools analyze storage devices for remnants of deleted files, including DWG and similar formats.

Does cloud storage provide built-in version recovery for CAD files?

Platforms like Dropbox, Google Drive, and OneDrive maintain older versions of files saved in their systems. These services can be used to recover and restore previous states of AutoCAD files effectively. Users can access, compare, and restore past versions directly in the cloud interface.

FAQ on Recovering Previous Versions of CAD Files

What is the fastest way to locate a previous CAD file version?

The fastest way is to use backup files like `.BAK` (for manually saved versions) and autosave files. Tools like SolidWorks Recovery Manager or AutoCAD Drawing Recovery simplify locating and restoring files quickly. Learn about protecting CAD files with the BORIS plugin.

What steps can minimize data loss during CAD crashes?

Enable autosave and regular backups in your CAD software settings. Save your work at key milestones and test recovery protocols periodically. Explore automated solutions like blockchain-based version control to ensure long-term file security. Check out compliance tools for SolidWorks users.

Can I recover overwritten CAD files using default software features?

Yes, built-in features like `.BAK` and Autosave files can help. Rename `.BAK` to the original file extension, or access the Recovery Manager to restore autosaved versions. However, for complex losses, external version control tools may be necessary.

How does manual versioning compare to automated tracking?

Manual versioning provides flexibility but depends heavily on user diligence, often leading to errors. Automated tracking, using tools like BORIS, ensures changes are logged systematically, improving recovery accuracy and file security.

What risks exist when relying solely on default recovery tools?

Default tools often recover only the most recent states and can't address long-term version tracking or malicious deletions. Consider integrating external solutions for encryption and detailed file history to ensure data resilience.

Can cloud storage improve recovery efforts for CAD projects?

Cloud storage provides redundancy and quick file restoration. Many platforms offer built-in version history tracking, making it easier to manage and recover CAD files. However, ensure files are encrypted for added security against unauthorized access.

How can you stop accidental CAD file overwrites?

Use clear file-naming conventions with version numbers. Automated tools like BORIS prevent overwrites by logging every file state on a blockchain, allowing precise rollback options.

What common CAD file recovery mistakes should you avoid?

Avoid working directly on original files, which increases risks of accidental overwrites. Also, ignoring backup intervals and recovery testing often leads to avoidable data losses.

How does file security impact IP compliance in CAD workflows?

Secure storage and recovery tools align with IP regulations by ensuring controlled access and tamper-proof logs. Blockchain-based solutions, like those offered by CADChain, enhance compliance across distributed teams.

Should small teams consider automated recovery tools?

Yes, automated tools reduce human error and provide robust security for growing projects. Small teams with multi-user workflows benefit from efficient version control and simplified recovery processes, critical for scaling successfully.