Attachments take up disk space and hence increase the size and time of your backups, but the total volume doesn't matter to JIRA really.
JIRA is not built to handle large files, you may run into interrupted uploads or downloads if you allow very large files to be attached, and sometimes memory issues if they're renderable. Some plugins will also struggle.
It's a simple global settings under admin -> attachments. It applies to all files being attached individually, it has nothing to say about where it's applied (i.e. you can attach 1000s of files to one issue, as long as each individual file is under the file size limit)
Have you signed up for "Enterprise support"? If not, then there's no telephone support, you'll need to raise an issue with support directly (they're usually fast to respond, and will do telephone support if it becomes useful, but you'll need an issue with them first)
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