Someday, no matter how careful you filtered your power supplies, no matter how carefully you cleaned the dust off your hard drives and measured their temperature, no matter what, you're going to lose your computer. The disk drive, the CPU the power supply, something is going to fail.
NOTE: XTension versions prior to 9.3.12 (build 977) may not include the root folder in the zipped backups. At some point the OS command to zip up a file changed. When you unzip a database backup created by one of these versions you may find that it contains a folder called “Contents” and not the folder/package called “XTension Database.” All your data is still in there though, you just have to create that folder manually. Create a folder and name it “XTension Database” and move the unzipped Contents folder into it. Now you have a valid database that you can move into the proper position to replace a corrupted or otherwise not working database.