I have an older server that I have not upgraded in a LONG time. I want to upgrade it from 6.4.1 and it shows that the update available is 7.0.1.

This is quite a few versions. Should I be aware of any issues? I have removed a bunch of older plugins that appear to have been deprecated. Anything else that I should do before upgrading? The Update assistant said to update these but most of them can't be updated so I have got rid of them for now. One of the things I had to get rid of was Fix Common Problems, which had the update assistant and now I am flying blind. And the Apps tab isn't working as it gives me an error as seen below. But I will uninstall that plugin as well, since that is from the days when it was still a plugin.

Something really wrong went on during force_update
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<br /> <b>Fatal error</b>: Allowed memory size of 134217728 bytes exhausted (tried to allocate 23072768 bytes) in <b>/usr/local/emhttp/plugins/community.applications/include/helpers.php</b> on line <b>47</b><br />

I have backed up the USB Flash drive. If things go wrong can I just restore it and everything should go back to 6.4.1?

1 hour ago, wayner said:

If things go wrong can I just restore it and everything should go back to 6.4.1?

Yes

Create a full flash drive backup before updating, and it's also a good idea to read the release notes for the major versions in between, like 6.5.0, 6.6.0, etc