I quit using Time Machine a few major OS updates ago, starting with Mountain Lion and through to High Sierra. When my disk filled up, I let it go for a while until it occurred to me that I might want to keep the old backup for archival purposes. My plan now is to clone the old time machine file to a new, large disk and simply continue using it after it has been shut off for 6 months or more. Is this horrible practice and likely to cause problems or should I be OK? I plan to check the file before attempting.