Can i keep my old programs and sotwares if i upgrade from mac snow 10.6.4 to lion x 10.7.4

Hi,
I have iMac
Hardware Overview:
Model Name:          iMac
Model Identifier:          iMac11,1
Processor Name:          Intel Core i5
Processor Speed:          2.66 GHz
Number Of Processors:          1
Total Number Of Cores:          4
L2 Cache (per core):          256 KB
L3 Cache:          8 MB
Memory:          16 GB
Processor Interconnect Speed:          4.8 GT/s
Boot ROM Version:          IM111.0034.B02
SMC Version (system):          1.54f36
System Software Overview:
System Version:          Mac OS X 10.6.8 (10K549)
Kernel Version:          Darwin 10.8.0
Boot Volume:          The Sun
Boot Mode:          Normal
Secure Virtual Memory:          Not Enabled
64-bit Kernel and Extensions:          No
Time since boot:          28 minutes
I need to upgrade it to Lion X OS so I can install the new Xcode with the latest Simulator (5.1.1).
So my question is do I need to re-install all applications and programs after the upgrade?
What about my data? do I have to backup my data too?
I have old project for iPhone and iPad, do I have to upgrade them too?
Developer Information:
Version:          4.2 (4C199)
Location:          /Developer
Applications:
Xcode:          4.2 (828)
Instruments:          4.2 (4233)
Dashcode:          3.0.2 (336)
SDKs:
Mac OS X:
10.6:          (10K549)
iPhone OS:
5.0:          (9A334)
iPhone Simulator:
3.2:          (7W367a)
4.0:          (8A400)
4.1:          (8B117)
4.2:          (8C134)
4.3:          (8H7)
5.0:          (9A334)
Regards,

There are two methods you could use to perform the upgrade but first, back up your computer. As X42.. suggests, a bootable clone is a very good idea - use SuperDuper! or CarbonCopyCloner to make an exact duplicate of your computer's hard drive. This can be used as a backup and can also be used to boot into Snow Leopard should you need to do so.
To upgrade to Lion (1) download Lion and let it upgrade your computer. Your data and old programs will remain on the computer untouched. During the upgrade process Lion may find some plug-ins or programs that are definitely incompatible and put them into a folder labeled Incompatible Programs. (2) restart your computer from the clone backup you made and download Lion. Now use the installer to erase the computer's hard drive and install Lion on the computer's drive. Then use Setup Manager to migrate your data and programs.
In either case, as X42.. said, you may have some incompatible software which needs to be upgraded and some may no longer be supported. That's one of the advantages of having the Snow Leopard bootable external drive. I found that the simple upgrade (1) worked for nearly every computer I upgraded. I had one computer that required the erase and install (2) method.

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