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Welcome to the community.
A Vanilla install is made up of:
a database (this is the bit you MUST have if you want to preserve threads/posts/users etc from the old forum. This is stored separately from the Vanilla folder/files.
the Vanilla files, representing whichever version has been installed. This may include a customised theme and/or plugins.
Vanilla files without the database, your forum is lost.
A database without the Vanilla files, you can have a working forum in about 5-10 minutes.
It would help you to know which version of Vanilla is currently being run.
Feel free to ask for help if you go ahead with this. Normally, it is a pretty straightforward process.
OK, if it is Vanilla hosted, you would need to ask here
or get the current admin to contact Vanilla support.
From the FAQs, re data export,
Yes, you are the owner of your account data and we will provide a data export upon request. We provide exports within a reasonable time and at a reasonable frequency. Please contact your CSM to inquire about automated daily backup shipping.
I'm sure the Vanilla team would be helpful.
This forum only supports the self-hosted version (not because we're mean, just that we normally wouldn't know the answer...)
The link is working as expected from a Win PC using Firefox.