Snapshot Files 0kb

Hi,

I need to restore the site but the backup files that I downloaded previously are showing as zero bytes and I'm afraid to import them to restore from.

There is a version within the site backups already but I'm afraid to restore that since the local versions I have are zero.

Is this a common issue? Are they actually empty files?

Please advise how I can get a previous version restored asap as I believe there is a virus/spam effecting my site's functionality.

Thank you!

Todd