How can I close my Time Machine Sparsebundle so Time Capsule can do a scheduled backup?

Question

"Time Machine couldn't complete the backup to "Your Time Capsule". The backup disk image “/Volumes/Steven Weinberg's Time Caps-1/Steven Weinberg’s MacBook Pro (4).sparsebundle” is already in use."
I have both a Time Capsule and a 2Tb external drive using Time Machine to back up my laptop.
Is it as simple as when the Time Capsule goes to do a backup and finds that the other drive is in the midst of using Time Machine to do its backup that I get this notice on my desktop?
It's 10:30 AM now.  The last Time Capsule backup was almost 12 hours ago.
There have already been 6 Time Machine backups today on the 2nd drive.
Sounds like the Time Capsule really is being blocked from doing its job.
THe 1 Tb Time Capsule backs up to a .sparsebundle document which fills the Time Capsule at 985 Gb.  You can't open and peek inside the .sparsebundle backup file.
The other drive backs up to a .backupdb folder within which are subfolders for each backup which appears to be a complete recreation of thebacked-up 500 Gb hard drive on my MacBook Pro laptop.  And even though there are 37 separate folders with backups going back to Sept 2013 when I installed the second backup drive, it's only used about 500 Gb of its 2 Tb capacity.
1.  How can I solve my primary problem of freeing up the .sparsebundle file for the Time Capsule?
2.  Since both drives are using Time Machine to do the backup, why are they producing such diffrent backup file structures?
Steve

Answer 1

David Bean wrote:
So copying from a one-week-old TM volume was failing
Have you run Repair Disk on it?
I now realize that the folder in which the problem file(s) are stored on the backup,.DocumentRevisions-V100, is the folder in which OS X stores its versioning data for all users. I am now trying to work out whether I can safely delete these files from the backup
That does get damaged on occasion.  I haven't seen it in quite a while, so it's pretty rare.
You can delete it from the backups, via the TM interface, but you must be able to show invisible items). 
First, open the Terminal app (in your Applications/Utilities folder). Be very careful with this app.  It's a direct link into UNIX, the underpinnings of OSX, but without the protections of OSX.
In Terminal, the prompt looks like this:  <Computer Name>:~ <your name>$
(where <your name> is your short user name).  It's followed by a non-blinking block cursor.
Copy, do not type, the following after the prompt:
defaults write com.apple.finder AppleShowAllFiles 1
and press Return.
You should just see the prompt again.
Then see Time Machine - Frequently Asked Question #12 to delete all the backups of it.
and from the live system filestore so they don't get copied out to a backup again.
Yes. You will, of course, lose all previous versions, but since the file is corrupted, you may have lost some, most, or all of them already.
When done, run the same command to hide the invisible items, but replace the "1" with a zero.