A lot of fun TimeMachine details can be reached with pyobjc on OS X

timemachine.py

# Backup destination details are stored in: /Library/Preferences/com.apple.TimeMachine.plist
# 10.11

from Foundation import NSBundle
TMMenu = NSBundle.bundleWithPath_('/System/Library/CoreServices/Menu Extras/TimeMachine.menu')
AppleTMSettings = TMMenu.classNamed_('AppleTMSettings')

settings = AppleTMSettings.sharedSettings()

# @interface AppleTMSettings : NSObject
# {
#     NSMutableArray *_destinations;
# }
# 
# + (id)sharedSettings;
# @property(readonly, copy) NSArray *destinations; // @synthesize destinations=_destinations;
# - (BOOL)allowSMBDestinations;
# - (BOOL)canModifyRequiresACPower;
# - (BOOL)canChangeWarningWhenCulling;
# - (BOOL)canManuallyBackup;
# - (BOOL)canChooseBackupDevice;
# - (BOOL)canModifyBackupSet;
# - (BOOL)canEnableBackup;
# - (void)unskipItem:(id)arg1;
# - (void)skipItem:(id)arg1;
# - (void)excludeVolume:(id)arg1;
# - (void)includeVolume:(id)arg1;
# - (BOOL)isIgnoredPath:(id)arg1;
# - (id)excludedVolumes;
# - (id)includedVolumes;
# - (void)setShouldSkipSystemFiles:(BOOL)arg1;
# - (BOOL)shouldSkipSystemFiles;
# - (id)skippedPaths;
# - (void)setShowsWarningWhenCulling:(BOOL)arg1;
# - (BOOL)showsWarningWhenCulling;
# - (void)setSuspendHelperActivityTimeStamp:(id)arg1;
# - (id)destinationForNetworkURL:(id)arg1;
# - (id)destinationForMountPoint:(id)arg1;
# - (id)pathsOfMountedLocalDestinationVolumes;
# - (BOOL)hasDestination;
# - (void)_setCurrentDestinationNoSync:(id)arg1;
# - (void)setCurrentDestination:(id)arg1;
# - (id)currentDestination;
# - (id)destinationForID:(id)arg1;
# - (void)removeAllDestinations;
# - (void)removeDestination:(id)arg1;
# - (void)addDestination:(id)arg1;
# - (void)writeDestinations;
# - (id)_lastDestinationID;
# - (void)readDestinations;
# - (id)_updateDestinationFromDictionaryRepresentation:(id)arg1;
# - (void)setRequiresACPower:(BOOL)arg1;
# - (void)_tellHelperAboutPrefChange:(BOOL)arg1;
# - (BOOL)requiresACPower;
# - (void)setMobileTimeMachineEnabled:(BOOL)arg1;
# - (BOOL)isMobileTimeMachineEnabled;
# - (void)setAutoBackupEnabled:(BOOL)arg1;
# - (BOOL)isAutoBackupEnabled;
# - (void)_removeAliasData:(id)arg1 fromArrayForKey:(id)arg2;
# - (void)_removePath:(id)arg1 fromArrayForKey:(id)arg2;
# - (void)_removeString:(id)arg1 fromArrayForKey:(id)arg2;
# - (void)_addString:(id)arg1 toArrayForKey:(id)arg2;
# - (void)_setArray:(id)arg1 forKey:(id)arg2;
# - (id)_arrayForKey:(id)arg1;
# - (void)_syncAndNotifyExclusionsChanged;
# - (void)_syncAndNotifyPrefsChanged;
# - (void)_notifyExclusionsChanged;
# - (void)_notifyPrefsChanged;
# - (void)_sync;
# - (void)_prefsChangedNotification:(id)arg1;
# - (void)dealloc;
# - (id)init;

settings.readDestinations()

current_dest = settings.currentDestination()

# >>> current_dest.aliasVolumeName()
# u'Family Backup'

# @interface TMDestination : NSObject
# {
#     NSString *_destinationID;
#     NSData *_aliasData;
#     NSString *_aliasVolumeName;
#     NSArray *_trustedUUIDs;
#     NSImage *_icon;
#     BOOL _isNetworkDestination;
#     NSURL *_networkURL;
#     unsigned long long _availableCapacity;
#     unsigned long long _totalCapacity;
#     NSURL *_mountPoint;
#     BOOL _isConfiguredDestination;
#     int _backupState;
#     unsigned long long _copiedBytes;
#     unsigned long long _totalBytes;
#     double _percentBackedUp;
#     NSArray *_snapshotDates;
#     NSDate *_delayedBackupWarningDate;
#     NSNumber *_latestBackupResultCode;
#     NSArray *_latestBackupResultParameters;
#     BOOL _isEncrypted;
#     double _percentConverted;
#     BOOL _isConverting;
#     NSString *_volumeDisplayName;
#     NSString *_serverDisplayName;
#     NSString *_timeCapsuleDisplayName;
#     NSTimer *_updateTimer;
#     BOOL _updatePending;
#     int _latestBackupResultSeverity;
#     unsigned long long _order;
#     double _estimatedSecondsRemaining;
# }