Not as good as off premises backup, but I use the following. (1) PC with two drives in a Windows ReFS RAID 1. (2) All computers back up to the RAID. (3) RAID backed up to a portable drive kept in Fire Safe. Why ReFS RAID 1: If a drive dies, then remaining drive is a duplicate. Either drive can be physically removed and plugged into another Windows 8+ PC for read if necessary. Decent performance. Free with Windows 8 or newer. The only maintenance is the occasional backup to drive in Fire Safe. Simple, no membership fee, yep it's not perfect but it's good enough for our family use.