It sounds like most of the 26h downtime was spent restoring backups. Incidentally, this is exactly the reason why Tarsnap is unusable for me for production environments. Backup restoration (as a user) is excruciatingly slow. When my systems are offline, I have no patience to wait for hours for my backup service. Maybe things are better now; Last I tried was a few years ago when Tarsnap took on the order of magnitude of one hour to restore a backup of a few GBs.