I tried restoring a couple of small files. After clicking the checkboxes on the right files and submitting the form it told me they were preparing the restore. A few minutes later I got an email saying “The files you selected for restore are ready” including a link to download them. They were in a zip file so I presume larger restores will produce larger zip files.

If I’m restoring lots of files I’ll do them in bursts. The cloud backup is more of an insurance that I hope I’ll never have to use. It’s not online storage and they make that clear in their docs. For example, if you backup an external drive connected to your PC and remove the drive, backblaze will presume you deleted the files and will delete their backups of those files after 30 days. I saw some complaints about this on forums but it’s backup, not storage they do.