How can I tell if my Time Machine backups are encrypted?

Hi - I would really appreciate it if someone could help me find out if my Time Machine backps are actually encrypted.
I know that there is an 'encryption' option when choosing a disc for Time Machine to backup to, but the problem is I cannot remember whether or not I actually ticked it (as it was a couple of years ago).
Other info that might be helpful:
- The disk I use Time Machine to backup to is actually a Apple Time Capsule
- I do have FileVault2 enabled on my mac
- I have never encrypted the Time Capsule disc itself (via Disk Utility or anything similar)
- One possible clue might be: When I go into Time Machine preferences, and click on 'Select Disk...' (as if to choose another disk to back up to), and select the disc that Time Machine currently backs up to (i.e. the Time Capsule disc), it does show an 'Encrypt backups' checkbox at the bottom of the window... however this checkbox is unchecked and also greyed out.
Thanks in advance
a_quinn

a_quinn wrote:
- Because I originally created this Time Machine Backup (to the Time Capsule) back in my 'OS X Lion' days,
I wondered; you posted in the Mountain Lion forum, but your profile still says Lion.
that means that my backups now (and moving forward) will continue to be un-encrypted
Correct (as of now, anyway).  You cannot encrypt existing network backups.  I doubt that will be available in the future, and would take forever. 
- The only way to encyrpt my backups now, moving forward, is to remove this Time Capsule disc (from Time Machine Preferences), and start all over again ensuring that I check the checkbox next to 'Encrypt Backup' when selecting the Time Capsule's disc to backup to.
Well, in theory it's possible, but would take forever, squared. 
You could archive the TC's contents to a USB drive connected to it, per #Q6 in Using Time Machine with a Time Capsule). 
Then delete the original, start a backup with encryption, and as soon as the encrypted sparse bundle is created, cancel the backup.
Mount the sparse bundle, open the disk image, and delete the Backups.backupdb folder inside it.
Connect the USB drive to your Mac, mount that sparse bundle, open its disk image, and copy the Backups.backupdb folder to the one on the TC.
Depending on how large the sparse bundle is, that could easily take a couple of days, at least, even connected via Ethernet.
Just for testing one day, I encrypted a very small set of existing test backups on a F/W 800 drive - 6 dated backups using a whole 12 GB.  Took an hour.
An alternative would be, just do the "archive" and keep the USB drive "on the shelf" for a while.  You can always connect it to your Mac and access those backups via the Browse Other Backup Disks option. 
Trying to keep a couple of years worth of backups usually isn't a good idea.  It's a very complex structure, so the odds of damage increase, it takes much longer to populate the TM browser, and it works slower and slower, and if you didn't need something for 6 months, are you really going to need it in 2 years?

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