Before I upgrade to Yosemite, can an "expert" please assist

Hi all,
I have been putting off updating to Yosemite after reading about lots of bugs & issues people have had.
Now deciding that I would like to take the plunge, I am still worried that if something goes wrong I won't have a clue what to do.
Ive just run an Etre check and would like one of you very clever & knowledgeable people to take a look and let me know if I have any problems on my  2011 iMac, running OS X 10.8.5.
Thanks.
Problem description:
Just a check on health of my iMac
EtreCheck version: 2.1.8 (121)
Report generated 4 April 2015 14:53:02 BST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    iMac (21.5-inch, Mid 2010) (Technical Specifications)
    iMac - model: iMac11,2
    1 3.06 GHz Intel Core i3 CPU: 2-core
    4 GB RAM
        BANK 0/DIMM0
            Empty  
        BANK 1/DIMM0
            Empty  
        BANK 0/DIMM1
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM1
            2 GB DDR3 1333 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: Unknown
Video Information: ℹ️
    ATI Radeon HD 4670 - VRAM: 256 MB
        iMac 1920 x 1080
System Software: ℹ️
    OS X 10.8.5 (12F2501) - Time since boot: 0:45:17
Disk Information: ℹ️
    WDC WD5000AAKS-40V6A0 disk0 : (500.11 GB)
        disk0s1 (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 499.25 GB (230.42 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
    OPTIARC DVD RW AD-5680H 
USB Information: ℹ️
    Apple, Inc. Keyboard Hub
        Apple, Inc Apple Keyboard
    Western Digital My Book 1230 2 TB
        disk1s1 (disk1s1) <not mounted> : 210 MB
        Jane's WD Drive (disk1s2) /Volumes/Jane's WD Drive : 2.00 TB (1.71 TB free)
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Internal Memory Card Reader
    EPSON EPSON Epson Stylus SX218 Series
    Apple Inc. Built-in iSight
    Apple Computer, Inc. IR Receiver
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /System/Library/Extensions
    [not loaded]    com.seagate.driver.PowSecDriverCore (5.0.1) [Click for support]
        /System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_4 (5.0.1) [Click for support]
    [not loaded]    com.seagate.driver.PowSecLeafDriver_10_5 (5.0.1) [Click for support]
    [not loaded]    com.seagate.driver.SeagateDriveIcons (5.0.1) [Click for support]
Launch Agents: ℹ️
    [running]    com.seagate.SeagateStorageGauge.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [running]    com.memeo.Memeod.plist [Click for support]
User Login Items: ℹ️
    Garmin Express Service    Application  (/Applications/Garmin Express.app/Contents/Library/LoginItems/Garmin Express Service.app)
    iTunesHelper    Application Hidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    MemeoAgent    Application  (/Library/Application Support/Memeo/Memeo Backup/Agents/MemeoAgent.app)
Internet Plug-ins: ℹ️
    JavaAppletPlugin: Version: 14.5.0 - SDK 10.8 Check version
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.1
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
    GarminGpsControl: Version: 4.1.0.0 Release - SDK 10.7 [Click for support]
    AmazonMP3DownloaderPlugin101749: Version: Unknown
    iPhotoPhotocast: Version: 7.0 - SDK 10.8
Safari Extensions: ℹ️
    donation reminder
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: OFF
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 499.25 GB Disk used: 268.83 GB
    Destinations:
        Jane's WD Drive [Local]
        Total size: 2.00 TB
        Total number of backups: 71
        Oldest backup: 2014-03-29 21:17:49 +0000
        Last backup: 2015-04-04 13:11:49 +0000
        Size of backup disk: Excellent
            Backup size 2.00 TB > (Disk size 499.25 GB X 3)
Top Processes by CPU: ℹ️
         3%    WindowServer
         1%    iTunes
         1%    coreaudiod
         0%    fontd
         0%    NotificationCenter
Top Processes by Memory: ℹ️
    318 MB    App Store
    288 MB    WebProcess
    228 MB    iTunes
    155 MB    Safari
    73 MB    mds
Virtual Memory Information: ℹ️
    1.46 GB    Free RAM
    1.85 GB    Active RAM
    407 MB    Inactive RAM
    578 MB    Wired RAM
    394 MB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Apr 4, 2015, 02:06:16 PM    Self test - passed

Check the OWC site. The 2 places I’ve seen recommended most to buy reliable RAM are below. I have purchased RAM several times from Other World Computing and have always been very satisfied with the product and service. They have on-line instructions on how to replace the RAM. OWC has also tested RAM above what Apple states is the maximum. I now have 6GB installed on a early 2008 iMac supposedly limited to 4 GB and noticed an improvement.
Crucial
Other World Computing
Do a backup, preferable 2 separate ones on 2 drives.
One option is to create a new partition (~30- 50 GB), install the new OS, and ‘test drive’ it. If you like/don’t like it it, you can then remove the partition. Do a backup before you do anything. By doing this, if you don’t like it you won’t have to go though the revert process.
Check to make sure your applications are compatible.
Application Compatibility
Applications Compatibility (2)

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