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Message: <blockquote data-quote="MacInWin" data-source="post: 1896167" data-attributes="member: 396914"><p>Time Machine is an archival system. It is designed to be able to go back in time (hence the name) to a version of a file, or disk, before some change was made that is no longer needed/wanted. It is also a backup, in the sense that it does hold copy of the backed up drive in an external location. I have not had to go back more than a few weeks to retrieve a file that changed, or was deleted, that I wanted back. What I generally do with a new machine/upgrade to the OS is to start a fresh TM backup on a clean drive, hold the old one for a few weeks, then repurpose it for some other function. There probably is no need for a backup that is really old, unless you have business or tax documents that are not kept anywhere else.</p></blockquote><p></p>