This is another way to make an online backup of your wallet.dat.
These are the Windows instructions, but they can be done also on others ( linux/osx )
English isn't my mother language, but I hope you will understand it
Requirement:-
Java1 ) Go to
Wuala and click the "Download" button and install Wuala
2 ) Register a free account, you will get 1 GB
Optional: Go here and do the same:
C57JF5BJJ5MP7CPP4AFFYou will use my ref and you will get 2 GB instead of 1. ( I'll get 512 MB )
You have to use this ref before all other promo codes.3 ) Go here and use all valid promo codes:
http://www.retailmenot.com/view/wuala.comYou will get many more free GB
Use them here: Tools->Options->Buy storage->Promocode:
4 ) Go here Tools->Options->Trade storage and enable it ( set it as you like, 1 GB is enaugh )
You will get Pro features
Backup and
Sync free!
Option 1( another data folder )
5 ) Create a new folder on your Bitcoin folder,
example:
C:\Program Files (x86)\Bitcoin\Data
6 ) Add it to a new
backup folder in Wuala. (
NOT a Sync folder )
7 ) Now open settings of it,
Show settings8 ) Change Interval to
Continuos and Filter to:
blk*.dat,.lock,*.log,database,*.0**
( you will only backup
wallet.dat and
addr.dat )
9 ) Close Bitcoin if it is open.
Copy all files from
%appdata%\Bitcoin to
C:\Program Files (x86)\Bitcoin\Data10 ) Run Bitcoin with this command line:
bitcoin.exe -datadir=./dataOption 2( Default Bitcoin data folder )
5 ) Close Bitcoin if it is open.
6 ) Add the default Bitcoin data folder to a new
backup folder in Wuala. (
NOT a Sync folder )
Example: C:\Users\[your_user_name]\AppData\Roaming\Bitcoin
7 ) Now open settings of it,
Show settings8 ) Change Interval to
Continuos and Filter to:
blk*.dat,.lock,*.log,database,*.0**
( you will only backup
wallet.dat and
addr.dat )
9 ) Run Bitcoin
You can find some other ways to do it, just try 
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