How does it work for backing up?

Does it have any file types it doesn't back up/include?

Does it have any access/loading speed limitations for larger backups? That is, if I upload my Kontakt libraries to Backblaze, when then accessing my Backblaze account, do more end points, i.e. the Kontakt libraries' individual samples etc cause serious access speed issues? I know with others I've tried in the past, zipping them up as .zip or .7z would obviously result in less data points to search and load, so access speed is much quicker.

Any other observations, opinions, thoughts, issues?