Backing Up Your Squarespace Custom Code (Because You Should)
Here's a thing that happens to Squarespace designers more often than you'd think: someone deletes custom code by accident, and hours of CSS work vanishes. There's no version history. There's no recovery. It's just gone. I've been there. It's not fun.
Or worse, a client deletes code thinking it's "cleaning up" something, and you have to recreate work from memory. Or you hand off a site to another developer who doesn't understand which code blocks are custom and which are built-in, and they accidentally remove something important while trying to troubleshoot.
This is why backing up custom code matters. Let me talk about why this is important and how to do it properly.
Why Squarespace's Lack of Version Control Is a Problem
Most modern platforms have version control built in. You make a change, the system tracks it. You can see who changed what and when. You can revert to previous versions if something breaks. This is basic software practice.
Squarespace doesn't have this for custom code. You can use the code injection feature to add custom CSS and JavaScript. It works great. But there's no version history. No changelog. No way to see what changed or revert to a previous version. You're working directly against live code with no safety net.
If you're careful and methodical, this is fine. You make changes, test them, and move on. But if something goes wrong, you're stuck. A typo breaks your CSS. A client edits the code and introduces a bug. Someone accidentally deletes the entire code block thinking they're cleaning up a test.
Unlike WordPress where you can install backup plugins, or GitHub where version control is built-in, Squarespace gives you no native way to recover deleted code.
The Cost of Lost Custom Code
Let's talk about what this actually costs you. Say you've spent 8 hours perfecting custom CSS for a client site. You've got complex styling for custom layouts, responsive behaviour, micro-interactions, all of it working perfectly.
Someone deletes the code. Maybe it's an accident. Maybe a client was tinkering. Maybe there was a misunderstanding about what was custom and what was built-in. Now you've got a broken site and you need to reconstruct 8 hours of work.
If you have a backup, you recover in minutes. You paste the code back, test it, and you're done. If you don't have a backup, you're rebuilding from memory or from screenshots, and it's not a straightforward process. You might remember 90 per cent of the styling. That last 10 per cent takes forever to recreate.
This is a client-facing issue too. Their site is broken. They're frustrated. You're spending billable time recreating work that should have been preserved. The backup cost is zero. The recovery cost without a backup is substantial.
The Manual Backup Approach
The basic backup approach is simple: regularly copy your custom code somewhere safe. Every time you make significant changes, save a copy. You could use a text editor, Google Drive, GitHub, or any cloud storage.
Here's what you do. Open Squarespace's code injection settings. Copy all the custom CSS from the Site Styles section. Copy all the custom code from the Custom Code injection section. Paste it into a text file. Save it with a date. Do this after every significant change. Keep these files somewhere accessible.
This works, but it's tedious. You need discipline to do it regularly. You need to remember to do it. You need to label files clearly so you know which version is which. Most people don't do this consistently, which defeats the purpose.
The manual approach works for small projects with occasional code changes. It doesn't work if you're actively developing sites or managing multiple client projects. You'll forget to back up, or you'll create a backup and then change something else and not back that up too.
Documenting Custom Code for Handoffs
Beyond backups, you should document what custom code does. Not just for you, but for future developers who might work on the site.
Comments in your code are essential. Add comments explaining what each block of CSS is doing. If you've got complex responsive logic or JavaScript, explain the intent. Future you, six months from now when you've worked on a hundred other sites, will be grateful.
Keep a simple document noting what custom code is in place. Something like: "Homepage hero styling with parallax effect, custom form styling for contact form, responsive grid for portfolio section". This tells the next person what to look for and what's been customised.
Include instructions on how to modify things. If the hero height is controlled by a custom variable, document that. If there's a media query that controls mobile behaviour, explain what it's doing.
This documentation is particularly important if you're handing a site off to a client or another developer. They need to understand what's custom and what's not, or they'll accidentally break things trying to troubleshoot.
Code Organisation Strategies
If you're writing substantial custom code on Squarespace, organisation matters. You can't put everything in one giant CSS file. You need structure.
Most Squarespace designers organise their custom CSS by component. You might have sections for typography, colour overrides, layout tweaks, component styling, and responsive adjustments. Within each section, clear comments separate different parts.
Use consistent naming conventions. Don't randomly name things. If you've got custom classes in your HTML, name them clearly so they're searchable. Something like "custom-hero-section" is clear. Something like "blue-box-thing" is not.
Keep your code DRY (Don't Repeat Yourself). If you're writing the same style twice, extract it into a variable or a reusable class. This makes maintenance easier and reduces file size.
Use custom properties (CSS variables) for repeated values. If your site uses three shades of blue everywhere, define them as variables at the top of your CSS. Then if the client wants to change the colour scheme, you change three variables instead of finding every instance in your code.
Automated Backup Solutions
The better approach is automation. If backing up is automatic, you never forget. You never get caught without a recent copy.
The Squarehead Chrome Extension automates code backup. It monitors your Squarespace site and backs up custom code whenever you make changes. You don't have to think about it. It's running in the background. If something breaks, you can recover the previous version.
This solves the discipline problem. You can't forget to back up because the extension is doing it for you. It also solves the labelling problem because each backup is timestamped and easy to identify. You know exactly when each version was created.
Beyond backups, the extension also makes inspecting Squarespace sites straightforward. If you're learning from how another designer structured their code, or auditing a competitor's site, you can see the code clearly without hunting through DevTools.
Recovery Procedures
Have a recovery procedure before you need it. Know how you'll restore code if something goes wrong.
If you're using the manual backup approach, your procedure is: find the backup file, copy the code, paste it back into Squarespace, test thoroughly. Keep your backups organised by project and date so you can find them quickly.
If you're using automated backups, your procedure is: check the backup history, select the version you want, restore it, test. This is faster and more reliable because the system has timestamped backups and you can easily identify which version to restore.
Either way, test thoroughly after restoring. Don't just assume the restored code works. Check the site on desktop and mobile. Test any interactive elements. Verify that the code is complete and hasn't been corrupted during restoration.
Best Practices for Code Safety
Beyond backups, there are other safety practices worth adopting.
Test major CSS changes in a staging environment before deploying to production. Squarespace doesn't have built-in staging, but you can use a development version of the template to test changes safely.
Use Git for version control if you're writing code that will be maintained long-term. Version everything, not just CSS. This gives you a complete history and makes collaboration easier.
Be cautious when editing existing code. If you're not 100 per cent sure what a line does, leave it. Comments are your friend here. Well-commented code is much safer to modify because you understand the intent.
Don't give clients direct access to code injection unless you're certain they understand what they're doing. A well-meaning client trying to "fix" something can break everything. Educate them or keep code access restricted to you.
Treating Code As a Critical Asset
Here's the reality: custom code is a critical asset on a Squarespace site. It's what makes the site unique and functional. Losing it is genuinely problematic.
Treat it like any other critical asset. Back it up. Document it. Organise it. Have recovery procedures. Know how to restore it quickly if something goes wrong.
The difference between a designer who's prepared and one who isn't is having a recent backup when disaster strikes. The backup takes minutes. The recreation takes hours. The choice is obvious.
If you're working on Squarespace sites professionally, commit to backing up your code. Whether you do it manually or automate it with a tool, just do it. Future you will be incredibly grateful when something goes wrong and you can recover in minutes instead of spending hours rebuilding.
Related Reading
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Tools That Help
Squarehead Chrome Extension can help with the workflows discussed in this article.
Want to go deeper? The Squarehead Advanced Course covers these topics and more across 11 structured modules.
