Backing up an encrypted drive with Time Machine under Snow Leopard

In a nutshell, my question is “Can I back up an encrypted drive using Time Machine under Snow Leopard, and if so, how do I access its data from a previous day?”
I have a 1Tb USB drive connected to my MacBook, which runs Snow Leopard. The drive is formatted as Mac OS Extended (Journaled). This drive is included in the drives that Time Machine backs up. I used Disk Utility to create an encrypted drive on the USB drive (998Gb), also formatted as Mac OS Extended (Journaled). The encrypted drive is not on TimeMachine’s list of excluded files/drives.
When I go into Time Machine, I can see the USB drive and the encrypted drive in the side bar. I can access the files on the encrypted drive as long as I’m looking at how it stands now. But if I move backward in time, the encrypted drive is grayed out and inaccessible.  If I click on the USB drive, I get a window that tells me it is 75.9Gb in size, and nothing else is available to me.
When I open the back-up drive in Finder and navigate to Backups.backupdb > macbook name > some date and time, I see my MacBook’s hard drive and the USB drive. The encrypted drive is not shown. When I click on the USB drive, I see an entry for drivename.sparsebundle. When I click on that I’m prompted for the password for the encrypted drive. When I enter it, I get a warning telling me that the disk image could not be opened and that the encrypted drive has no mountable file systems.
Is my encrypted drive really be backed-up and if so, how do I access the backed-up data? 

Having received a bunch of views but no replies over the last 5 days, I decided to venture into my local Apple store and ask this same question. The response I got from the geniuses was that you can't get a reliable back-up of an encrypted drive using Time Machine under Snow Leopard. So, my only alternative is to copy the encrypted drive's contents elsewhere, unencrypt the drive, and then copy the contents back. This is what I expected, but not what I wanted to hear.

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    Time Machine spends hours partially backing up and then fails with "Time Machine couldn't complete the backup due to a network problem."  I've tried various suggestions I've seen on the forum but nothing has worked.  TIme Machine worked fine for the last two years and just suddenly started having this problem every time.  The only thing that was a little different is that the computer was off for a week while on vacation and then I added a large amount (20 GB) of photos. Now the requested backup size is 82GB, which is large, and process proceeds very slowly for 2-3 hours before failing with the message mentioned.  I have more than enough available backup storage space for it.  Before failing, Time Machine has backed up no more than 12GB or so of the backup.  It fails during different files each time.
    I've turned off the computer sleep feature, and I've checked that the NAS is set to never automatically power down. I normally backup over Wi-Fi, but I've also tried connecting to Ethernet and it still has the same problem.  It's odd because I also have a MacBook Pro that is still backing up fine to the same NAS using the MacBook's Time Machine. 
    I am using an iMac with OS X 10.6.8 and an Iomega StorCenter ix2-200 NAS.
    I have system logs that I can share if helpful.  The logged messages vary a bit from run to run, but here are some messages that I've been seeing:
    I always get this message near the beginning of the backup:
    Event store UUIDs don't match for volume: Macintosh HD
    I've gotten this messsage a number of times:
    Bulk setting Spotlight attributes failed.
    One Day
    Stopping backupd to allow ejection of backup destination disk!
    Another day
    1/7/12 10:44:20 AM
    mDNSResponder[18]
    PenaltyTimeForServer: PenaltyTime negative -112916, (server penaltyTime -1132397006, timenow -1132284090) resetting the penalty
    1/7/12 10:46:37 AM
    kernel
    ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0x1106be94
    1/7/12 10:46:37 AM
    kernel
    AFP_VFS afpfs_DoReconnect started /Volumes/TimeMachine prevTrigger 0 currTrigger 1
    Another Day
    1/6/12 8:03:22 AM
    Google Chrome[164]
    Cannot find function pointer CMPluginInFactory for factory 3487BB5A-3E66-11D5-A64E-003065B300BC in CFBundle/CFPlugIn 0x16f99e20 </Users/smarmer/Library/Contextual Menu Items/Google Notifier Quick Add CM Plugin.plugin> (not loaded)
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    com.apple.backupd[193]
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    1/6/12 8:06:58 AM
    /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer[1013]
    No valid tickets, timing out
    1/6/12 8:29:44 AM
    mDNSResponder[19]
    PenaltyTimeForServer: PenaltyTime negative -148702, (server penaltyTime 2056822773, timenow 2056971475) resetting the penalty
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    kernel
    ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0xa5ac380
    1/6/12 8:59:22 AM
    kernel
    AFP_VFS afpfs_DoReconnect started /Volumes/TimeMachine prevTrigger 0 currTrigger 1
    1/6/12 8:59:22 AM
    kernel
    AFP_VFS afpfs_DoReconnect:  doing reconnect on /Volumes/TimeMachine
    1/6/12 8:59:22 AM
    kernel
    AFP_VFS afpfs_DoReconnect:  soft mounted and hidden volume so do not notify KEA for /Volumes/TimeMachine
    1/6/12 8:59:22 AM
    kernel
    AFP_VFS afpfs_DoReconnect:  Max reconnect time: 30 secs, Connect timeout: 15 secs for /Volumes/TimeMachine
    1/6/12 8:59:22 AM
    kernel
    AFP_VFS afpfs_DoReconnect:  connect to the server /Volumes/TimeMachine
    1/6/12 8:59:22 AM
    kernel
    ASP_TCP asp_SetTCPQoS:  sock_settclassopt got error 57
    Another day
    1/5/12 3:48:55 PM
    mdworker[2128]
    CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
    1/5/12 4:24:54 PM
    mDNSResponder[19]
    PenaltyTimeForServer: PenaltyTime negative -42698, (server penaltyTime 1148718961, timenow 1148761659) resetting the penalty
    1/5/12 4:29:58 PM
    com.apple.backupd[2074]
    Copied 586.4 MB of 67.0 GB, 9891 of 9891 items
    1/5/12 4:39:00 PM
    kernel
    ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0xa1c0380

    bokon0n wrote:
    1/11/12 8:53:30 AM
    com.apple.backupd[1169]
    Warning: Destination /Volumes/TimeMachine does not support TM Lock Stealing
    1/11/12 8:53:30 AM
    com.apple.backupd[1169]
    Warning: Destination /Volumes/TimeMachine does not support Server Reply Cache
    Those indicate that your NAS is not fully compatible with Snow Leopard. 
    1/11/12 8:53:35 AM
    kernel
    jnl: disk2s2: replay_journal: from: 67182592 to: 78680064 (joffset 0xa7b8000)
    1/11/12 8:53:39 AM
    kernel
    jnl: disk2s2: examining extra transactions starting @ 78680064 / 0x4b09000
    1/11/12 8:53:39 AM
    kernel
    jnl: disk2s2: Extra txn replay stopped @ 79056896 / 0x4b65000
    1/11/12 8:53:49 AM
    kernel
    jnl: disk2s2: journal replay done.
    1/11/12 8:53:49 AM
    fseventsd[41]
    event logs in /Volumes/Time Machine/.fseventsd out of sync with volume.  destroying old logs. (253512 14 253512)
    1/11/12 8:53:50 AM
    kernel
    hfs: Removed 1 orphaned / unlinked files and 0 directories
    That looks like a problem was found with the file system (data) on the TM disk.  I don't know the details, but OSX tried to recover it from the journal, and found extra data on the drive.    Likely a result of the incompatibility mentioned above.
    1/11/12 9:47:40 AM
    com.apple.backupd[1169]
    Bulk setting Spotlight attributes failed.
    That's a problem writing to the NAS drive.
    But the backup continued after all this.
    1/11/12 1:25:07 PM
    kernel
    ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0x9d00b44
    Something caused a disconnect.  Can't tell from the log what it was.
    I doubt it's a problem with something in OSX being damaged or corrupted, but reinstalling OSX isn't a major hassle, so might be worth a try.
    To be incompatible with Snow Leopard, this NAS must be at least a couple of years old.  It may be beginning to fail.
    Contact the maker.  See if there's an update to make it compatible with Snow Leopard.  If so, that might fix it.
    If not, or if that doesn't fix it, see if they have any diagnostics that will shed any light.

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