Maybe this will be of some help..... Helped me out:
The BASICS
After the 1.05 update we are now allowed to backup and restore our game saves. But in the update, they reduced the number of cars you can gift to ONE/day. But you can receive as many gifts as you want.
In this thread, I will explain how to use these options to maximize your money and cars on your way to owning 1000 cars.
GENERAL HOW TO
Backup Your Game Data
To BACK UP your gamesave you will need any kind of thumb-drive or external hard-drive plugged into your PS3. At the PS3 XMB go to the GAME column and up to GAME DATA UTILITY. Now select GT5. Your game save should come up, it will tell you your Current Car, Money, and the day number. Press the TRIANGLE and select COPY. It will ask where do you want to copy it. Select the usb drive. Your game save is now backed up.
To RESTORE your gamesave. Go back into your GAME DATA UTILITY. But this time instead of going to GT5, select to the usb drive. Now click TRIANGLE. Copy. Confirm to overwrite it. Your game is now restored to the BACKED-UP DATA. Once it is on your thumb drive you can also save it onto your PC for safe storage. It will be in a folder called "PS3". Game saves CANNOT be transferred to a different username and you can only have one GAME SAVE on a thumb-drive at a time. I use 2 thumb-drives, one exclusively for my MAIN and the other for the ALT's. So i don't accidentally overwrite the important one.
Gifting
You can gift any Paint, Horn, Car Part or Car Ticket from your ITEMS list to someone on your friends list who has played GT5. Simply Press TRIANGLE and select GIFT. You can also gift Museum cards by pressing TRIANGLE while looking at your cards.
Gifting Cars can be done while in your garage. You can not gift the car you are currently "IN".
Remember you can ONLY GIFT ONE CAR/per DAY. But you can gift up to 5 horns, museum cards and paints per day. Car parts i'm not sure, probably 5. The concept of "one per day" confuses people. The gifting reset time is 0:00 GMT. This is roughly 7pm Eastern Time in the USA. You can in fact send a gift at 6:58pm EST and then send another 4mins later at 7:02pm EST. You wont be able to send again until after 7:00pm EST the next day.
To Receive a gift, You need to go to COMMUNITY in GT MODE. on the bottom it will say GIFTS. Select it and you can then RECEIVE them. If its a car, you will now have a car ticket in your "Car Receiving" icon in GT MODE.
Creating an ALT Account
Simply go to "Create an Account" in the USERS column at the PS3 XMB. The name you choose can be anything and it can be changed later. Once created, Log into the acct, sign up for PSN. You can use a random email but it has to be a working one. You do not have to actually create the email acct it just has to be in the form of an email address. For password "gt5gt5gt" is quick. Then for security question "here" works good. For name, address and city use "g". You must use a working State and ZIP combination. Then just continue until your done. Sign into PSN. Click "AUTO SIGN-IN". Go to "Add a Friend" and add your MAIN. Now sign into your MAIN to accept friend request.
It takes about 3 mins to create an ALT.
THE EXPLOITS
Duplicating A Car
Simply BACKUP your GAMESAVE. GIFT a car to your ALT. Then RESTORE. Log into your ALT. RECEIVE gift. Go to ITEMS and re-GIFT the ticket back to your MAIN. You dont have to go to your ALT's Delivery Semi and USE the ticket before GIFTing the car. That just wastes time. Once you RECEIVE and REDEEM your car in the MAIN acct. You will now have two. You can do this to sell valuable cars for money. Although you can make money faster doing some of the races. You can also do this if you want to Race-Mod a car and keep an original version. More than likely you would do this to give a car to someone (like for a trade) and you want to keep it for yourself. If so, BACKUP, GIFT to them, RESTORE.
The Birthday Present
You receive a free car, from the year you were born, on your birthday.
Because of this, you can get any car from 1993 or before for free. (under 18 year olds have more steps to create an acct, but you will also get something on your birthday) Simply create a new PSN acct. Use today's date for your birthday with the year of the car your looking for. When you load the game and go through the pop-ups, you get a free car ticket. Before using the ticket, I suggest buying the used yaris, save, quit. BACKUP save. Now when you load game and use the ticket, if its not the car you wanted, press PS button and go to GAME DATA UTILITY (up 3 clicks). It asks if you want to leave game. Say yes, and RESTORE and load game. You now will not have to go through the pop-ups. Try the ticket again. Once you get the car you want, GIFT to MAIN. After GIFTing you can RESTORE again and get another car that you want. You will not be able to Gift until the next day though.
It takes about 3 mins to try again for a different car.
Link for [link="https://spreadsheets.google.com/pub?key=0AilqorKfre_udFRGMWZ2NXA5a2x6SVRTWU4yVmRPc3c&hl=en&single=true&gid=0&output=html"]AVAILABLE CARS[/link]
Good cars to try to get:
Jaguar XJ13 Race Car '66
Ford Mark IV Race Car '67
Ferrari 330 P4 Race Car '67
Chaparral 2D Race Car '67
Ford GT40 Race Car '69
Toyota Toyota 7 Race Car '70
Chaparral 2J Race Car '70
Jaguar XJR-9 LM Race Car '88
Toyota MINOLTA Toyota 88C-V Race Car '89
Mercedes-Benz Sauber Mercedes C9 Race Car '89 (personal favorite)
Nissan R89C Race Car '89
Mercedes-Benz 190 E 2.5 16 Evolution II Touring Car '92 (touring car)
Nissan R92CP Race Car '92
Ferrari F40 '92 (135,000 resale, the most)
Grinding/Endurance Car
Do this Instead of rebuilding your Grinding/Endurance car after a lot of miles.
Create an ALT. Name it after favorite car. Now BACKUP your MAIN, rebuild motor/restore chassis, Buy all upgrades and tires for your favorite grinding car. GIFT it to the new ALT. RESTORE your MAIN. Now whenever your car gets old, just log into that ALT and gift yourself another grinding car in perfect condition.
Endless Money
Instead of wasting your money on the expensive cars and upgrades, try the following.
BACKUP your save. Buy the car you want. Change the oil, rebuild the motor, restore the chassis, wash it, paint it, paint the rims, add aero kits. Buy every tuning part available including every set of tires. Spare no expense! Now gift it to your ALT. RESTORE your save, and you got all your money back. Now re-GIFT back to your MAIN. You get the Car and the Money!!
Level Car Tickets:
These are a perfect way to increase the numbers of cars you own without spending a dime!
There are car level 0, 3, 6, 9, 11 and 15 tickets from the licenses. 5, 9, 12, 17, 21, 24 tickets from A-Spec and B-spec. You get a Random 1000 Ticket for every 100 wins and 2000km in A-spec. I suggest creating another ALT and naming it the Level of the ticket. Once you gift the ticket to the ALT, everyday you can BACKUP, Use Ticket, GIFT, RESTORE. You can eventually get all the cars in that level!!
For the upper levels here are some cars you can get:
Level 12:
Audi R8 5.2 FSI quattro '09
Chevrolet Corvette Z06 (C6) '06
Citroën Citroën C4 WRC '08
Citroën GT by Citroën Road Car
Dodge Viper SRT10 Coupe '06
Ferrari 599 '06
Ferrari F430 '06
Ferrari SP1 '08
Ford Focus RS WRC 07 '08
Jay Leno Tank Car '03
Lamborghini Gallardo LP 560-4 '08
Lexus LFA '10
Mine's LANCER EVOLUTION VI '00
Mitsubishi Lancer Evolution Super Rally Car '03
NISMO Fairlady Z Z-tune (Z33) '03
NISMO Skyline GT-R R-tune (R34) '99
Nissan C-WEST RAZO SILVIA (JGTC) '01
Nissan GT-R Black Mask '07
Nissan GT-R SpecV '09
RUF CTR2 '96
Shelby Cobra 427 '66
Suzuki SX4 WRC '08
Toyota Atenza Touring Car
Level 17:
Amuse Carbon R (R34) '04
Audi A4 Touring Car '04
Audi Abt Audi TT-R Touring Car '02
Ford GT40 Race Car '69
HKS GENKI HYPER SILVIA RS2 (D1GP) '04
Honda ARTA NSX (JGTC) '00
Honda Castrol MUGEN NSX (JGTC) '00
Honda LOCTITE MUGEN NSX (JGTC) '01
Honda Mobil 1 NSX (JGTC) '01
Honda NSX-R Prototype LM Race Car
Honda RAYBRIG NSX (JGTC) '00
Honda TAKATA DOME NSX (JGTC) '03
HPA Motorsports FT565 twin turbo Audi TT (SEMA Gran Turismo Awards 2007)
McLaren F1 '94
Nissan FALKEN*GT-R Race Car '04
NASCAR (Level 21):
Chevrolet 2010 Dale Earnhardt Jr. #88 AMP Energy/National Guard CHEVROLET IMPALA '10
Chevrolet 2010 Jeff Gordon #24 DuPont CHEVROLET IMPALA '10
Chevrolet 2010 Jimmie Johnson #48 Lowe's CHEVROLET IMPALA '10
Chevrolet 2010 Juan Montoya #42 Target CHEVROLET IMPALA '10
Chevrolet 2010 Tony Stewart #14 Office Depot/Old Spice CHEVROLET IMPALA '10
Ford 2010 AJ Allmendinger #43 Best Buy FORD FUSION '10
Ford 2010 Carl Edwards #99 Aflac FORD FUSION '10
Toyota 2010 Brian Vickers #83 Red Bull TOYOTA CAMRY '10
Toyota 2010 Denny Hamlin #11 FedEx TOYOTA CAMRY '10
Toyota 2010 Joey Logano #20 The Home Depot TOYOTA CAMRY '10
Toyota 2010 Kyle Busch #18 M&M'S® TOYOTA CAMRY '10
Level 21:
Amuse S2000 GT1 '04
Amuse S2000 GT1 Turbo
Bugatti Veyron 16.4 '09
Chaparral 2D Race Car '67
Chevrolet Camaro LM Race Car
Citroën GT by Citroën Race Car
Dodge Viper GTS-R Team Oreca Race Car #51 '00
Ferrari 330 P4 Race Car '67
Ford GT LM Race Car
HKS CT230R '08
Jaguar XJ220 LM Race Car
Lamborghini NOMAD Diablo GT-1 (JGTC) '00
Lister Storm V12 Race Car '99
NASCAR (See Above)
Nissan XANAVI NISMO Z (SUPER GT) '06
TVR Cerbera Speed 12 '00
Level 24:
Formula Gran Turismo
Ferrari F2007
Ferrari F10 '10
Shop at will with your ALT acct!
XXxxxxLIMITED TIME ONLYXXxxxxX
SEASONAL EVENT: Race Series 3 is easy as hell because you can fully tune the cars. (you can go back and redo series 2 now, tuned also) You dont need to be a certain level to try them either. SOOO, GIFT your ALT a fully tuned Citroen C4 WRC '08 and win the NEW event. With the credits, you'll instantly be level 17 with 1.5 million. With the money buy the Ford GT and tune it. Win that race. You Will now be level 19 with 2.5 million. IN JUST 2 RACES! BACKUP save. SHOP, GIFT, RESTORE each day! There are some good cars you can BUY and TUNE with that money to gift to your MAIN!
--------------------------------------------------------------------------------