Roll back from yosemite to mavericks without time machine

I am currently a user of Retina Macbook Pro late 2013, 13", i5 with 2.4 GHz, 8gb, 1600MHz DDR3.
I faced a huge problem after updating my mac from Mavericks 10.9.5 to Yosemite 10.10, this has caused my mac to running slow, but before updating it was so smooth and worked perfectly.
- Yosemite causes my mac to be so laggy when scrolling up and down. Sometimes, it crashes all of a sudden when you are just watching a video using Safari.
- Scrolling through PDF files is so laggy
- Minimizing Apps is not as smooth as before.
My Question :
- How to roll back to mavericks/ downgrade from yosemite to mavericks? provided that i didn't not have a time machine backup. And so far i could not find any installer for mavericks in app store.

No. You need to first erase the drive then install Mavericks. Try backing up your files (Home folder) somewhere. Boot from your Mavericks drive. From it use Disk Utility to erase your Yosemite drive. Clone the Mavericks drive to the drive you just erased. Now restore your data from the backup you made.
Of course if your Mavericks drive also has a current copy of your Home folder from the Yosemite computer, then all you need to do is boot from it, erase the Yosemite drive, clone the Mavericks drive and you're done.

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    I'm wondering what the options are for backups without Time Machine
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    Methodology to protect your data. Backups vs. Archives. Long-term data protection
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    12. TM like all HD-based data is subject to ferromagnetic and mechanical failure.
    13. *Level-1 security of your vital data.
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    2. TM is a perfect novice level simplex backup single-layer security save against internal HD failure or corruption.
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    1. HD clones are the best, quickest way to get back to 100% full operation in mere seconds.
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    3. HD clones are unconnected and isolated from recent corruption.
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    7. *Level-2 security of your vital data.
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    2. Carbon Copy Cloner APP (will copy the recovery partition as well)
    3. Disk utility HD bootable clone.
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    Drawbacks:
    1. Subject to server failure or due to non-payment of your hosting account, it can be suspended.
    2. Subject, due to lack of security on your part, to being attacked and hacked/erased.
    Advantages:
    1. In case of house fire, etc. your data is safe.
    2. In travels, and propagating files to friends and likewise, a mere link by email is all that is needed and no large media needs to be sent across the net.
    3. Online archives are the perfect and best-idealized 3rd platform redundancy for data protection.
    4. Supremely useful in data isolation from backups and local archives in being online and offsite for long-distance security in isolation.
    5. *Level-1.5 security of your vital data.
    #5. DVD professional archival media
    Drawbacks:
    1. DVD single-layer disks are limited to 4.7Gigabytes of data.
    2. DVD media are, given rough handling, prone to scratches and light-degradation if not stored correctly.
    Advantages:
    1. Archival DVD professional blank media is rated for in excess of 100+ years.
    2. DVD is not subject to mechanical breakdown.
    3. DVD archival media is not subject to ferromagnetic degradation.
    4. DVD archival media correctly sleeved and stored is currently a supreme storage method of archiving vital data.
    5. DVD media is once written and therefore free of data corruption if the write is correct.
    6. DVD media is the perfect ideal for “freezing” and isolating old copies of data for reference in case newer generations of data become corrupted and an older copy is needed to revert to.
    7. Best-idealized 4th platform redundancy for data protection.
    8. *Level-3 (highest) security of your vital data. 
    [*Level-4 data security under development as once-written metallic plates and synthetic sapphire and likewise ultra-long-term data storage]
    #6. Cloud based storage
    Drawbacks:
    1. Cloud storage can only be quasi-possessed.
    2. No genuine true security and privacy of data.
    3. Should never be considered for vital data storage or especially long-term.
    4. *Level-0 security of your vital data. 
    Advantages:
    1. Quick, easy and cheap storage location for simplex files for transfer to keep on hand and yet off the computer.
    2. Easy source for small-file data sharing.
    #7. Network attached storage (NAS) and JBOD storage
    Drawbacks:
    1. Subject to RAID failure and mass data corruption.
    2. Expensive to set up initially.
    3. Can be slower than USB, especially over WiFi.
    4. Mechanically identical to USB HD backup in failure potential, higher failure however due to RAID and proprietary NAS enclosure failure.
    Advantages:
    1. Multiple computer access.
    2. Always on and available.
    3. Often has extensive media and application server functionality.
    4. Massive capacity (also its drawback) with multi-bay NAS, perfect for full system backups on a larger scale.
    5. *Level-2 security of your vital data.
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    Identical to NAS in form factor except drives are not networked or in any RAID array, rather best thought of as a single USB feed to multiple independent drives in a single powered large enclosure. Generally meaning a non-RAID architecture.
    Drawbacks:
    1. Subject to HD failure but not RAID failure and mass data corruption.
    Advantages:
    1. Simplex multi-drive independent setup for mass data storage.
    2. Very inexpensive dual purpose HD storage / access point.
    3. *Level-2 security of your vital data.
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    A file that is backed up to Time Machine is unsafe in that if that file is deleted off the computer by accident or lost otherwise, that file will likewise vanish from Time Machine as it reflects changes on the internal computer HD/SSD.

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