Almost deleted my Time Machine backup

This is my very first post so I might be missing something.
I have an external disk for Time Machine.
I made a manual backup on Dec 28 and I wanted to delete one particluar file, so I right-clicked it and selected "Delete Backup", which was a WRONG button to push.
I accidentally ordered my Mac to delete the "entire entry for Dec 28."
I then got out of the Star Wars interface, and clicked the X(cancel) button on the "Preparing to delete stuff" progress bar.
Now I don't see the Dec 28 entry in the Star Wars screen, plus the Last Backup indicated by the dropdown menu shows the one before Dec 28.
Fortunately, nearly everything was untouched. Nearly, that is, the timestamp showed that (Time Machine bkup dir)/usr/share/man/man1/ was being altered (zapped?) when I cancelled deleting. There might be other dirs gone, though, my valuable items seem all OK, by the looks of the backup directory itself.
I haven't tried "Back Up Now" because I fear that the Dec-28 entry might be discarded.
Is it possible to get back that backup entry?
Message was edited by: x86_64

first, you should back up regularly. backing up once in 4 months does not qualify in any way. secondly, you should NOT use TM backups as a storage tool. a backup is a second copy, not the only copy. and this is especially true for TM. using it for storage is highly likely to result in a loss of data because TM constantly thins past backups (which it does silently and without any warning). also, when it runs out of space it starts deleting old backups to make room for new ones. it's supposed to warn you about it the first time it does it but that warning is easy to miss and it sometimes doesn't show up at all.
so if you have something on that backup you deleted from the main drive, restore it from TM and do another full backup. and don't use TM backups for storage from now on.

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