Why does Time Machine back up so frequently?

I've noticed Time Machine trying to back up as frequently as every 20 minutes rather than every hour.  I'm also puzzled because it continually wants to back up some 15MB or more when I've changed nothing and excluded Safari-related folders from TM in an attempt to keep all the cookies and caches from backing up.
I can't seem to find a setting in TM to change back-up frequency and it's frankly annoying.
This is with a 2011 version MacBook Air and a 2008 version Time Capsule with current software/firmware updates.

I'm also puzzled because it continually wants to back up some 15MB or more when I've changed nothing
Suggest that you download and install BackupLoupe to find out exactly what is being backed up on each pass.
soma-zone: BackupLoupe
If you want to change the backup frequency of Time Machine, an application like Time Machine Editor will allow you schedule backups whenever you like. But, you may not need to do this if you can figure out what might be causing the first issue.
TimeMachineEditor
If you ever decide to delete Time Machine Editor, be sure to change the backup frequency back to hourly before you delete the application.

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    I'm also puzzled because it continually wants to back up some 15MB or more when I've changed nothing
    Suggest that you download and install BackupLoupe to find out exactly what is being backed up on each pass.
    soma-zone: BackupLoupe
    If you want to change the backup frequency of Time Machine, an application like Time Machine Editor will allow you schedule backups whenever you like. But, you may not need to do this if you can figure out what might be causing the first issue.
    TimeMachineEditor
    If you ever decide to delete Time Machine Editor, be sure to change the backup frequency back to hourly before you delete the application.

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