Time Machine can not find previous backup

Please help. I have done a full backup on Jan 26, but I can not find this date in the time travel window and Finder. I haven't change the user name. It just somehow has gone. I sure that the files should be somewhere inside the hard drive since it has taken away 60 GB. What can I do?

nerowolfe wrote:
Pondini wrote:
If you don't have a completed backup in several days, TM will not do an incremental backup, but a new, full, backup of everything on your system.
Not really true. If the computer is used with the TM drive turned off or disconnected, perhaps, but on my two computers that I do not use all the time, when I turn them on, the backups continue as if nothing has happened, which, of course is the case. For example, with my G that I may use once a week or even once in several weeks, when I turn it on, the next backup is perfectly normal.
I think you are correct when the total amount of data change is large enough to require a full backup, but this would only happen if the TM drive were not running whenever the computer is running, thereby creating a large gap, so to speak, between the state of the computer HD and the TM HD.
There are several threads here by folks who've suddenly had TM backups fail, for lack of space, because TM was doing a full backup (confirmed by their logs), after no backups for several days, and couldn't delete enough old backups to get space for the new one. Some had seen a warning about no backup, some didn't recall.
There's even a debate about how long it is -- some think it's 10 days (because they'd had a warning to that effect), others say they've gone longer, still others think it's a combination of time and volume of changes (I suspect that's the case). But I don't recall anybody saying they'd gone a month without TM doing a new, full, backup.
And I don't see how it would matter whether the TM drive was running or mounted; as long as TM was off or couldn't successfully do a backup, the result is the same: x days without one.

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