If you have a MAK key (home networking package) then I *strongly* suggest you use WinMFS to make a .tbk backup regardless of what you do. Once you lose that unique software on your TiVo (ie a hard disk failure) you will never get your MAK back.
If you don't have a MAK key then it's up to you whether you make a .tbk backup as any oztivo TiVo image will bring it back to life.
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