I have a wordpress outdated for a year, when I backup and restore it, the application suffers from crashes and critical errors, how to fix this?
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I think your problem is with software versions. If your WordPress hasn’t been update for a year, it’s possible that it doesn’t support latest versions of PHP.
But I don’t know if you’re trying to backup and restore on the same server or on a different server.
If you’re trying to restore on the same server, there can’t be a PHP version compatibility issues.
May be you can clarify that for us.
If you’re trying to restore on a different server, version compactivity might be at play. And it becomes tricky.
I suggest checking your current PHP version by going to WP Admin > Tools > Site Health > Info > Server
And then installing and configuring same PHP version on the new server using this tutorial, https://vpsfix.com/7091/multiple-php-versions-virtualmin-nginx/
Idea is to get your site working as is on the new server first. And then you can upgrade WordPress and then PHP to the latest versions. If you think this is challenging to do for you, you can hire a freelancer on Fiverr to do it, https://vpsfix.us/fiverr/server-help
In addition to what has already been mentioned, feel free to share the exact critical errors that you are getting so I could try to advise you on how you might be able to solve those problems.
In general, it sounds like a PHP version mismatch, for example, your website might have been built for an older PHP version.
How do you backup and restore it? Are you using Snapshots? If not, I’ll recommend you to use them instead:
Snapshots are on-demand disk images of DigitalOcean Droplets and volumes saved to your account. Use them to create new Droplets and volumes with the same contents.
Additionally, if you mean crashes and critical errors of your website, what do you see in your error logs? It’s possible your Droplet can’t handle the traffic or if you need to up your php limits.