Does Time Machine have rules?

I just wanted to ask, does Time Machine have rules?
A rule for example could be "delete all files older than 6 months from backup except those in the listed/protected folders". Thanks for your help.
The thing is I'm concerned that old files remaining on the external drive will result in the drive filling up fast, and that I'll do better to just use a regular back up app instead. That means replacing the existing backup with the newer updated copy of my files. That has always worked for me. Can Time Machine do that?

Time Machine has these rules:
1.Backup all altered files once every hour for the most recent 24 hours.
2.Keep daily backups for the most recent month.
3.Keep weekly backups until the drive is full.
After the whole drive has been completely backed up for the first time, one can select folders or files that are to be ignored whether they change or not with the "options..."(?) button in Time Machine preferences(i.e files/folders that are to be ignored considering future backups).
As far as I know that´s all there is to it.
Hope that helps.

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    Message was edited by: joshz
    Message was edited by: joshz

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