No external; will I lose all data if I upgrade to SL?

Greetings. I do not have an external hard drive and just purchased Snow Leopard. I have roughly 50 gb of music I do not want to lose, will upgrading to SL destroy all of my old files from Leopard? I only ask this because way back when I upgraded from Microsoft 98 to XP and recall losing everything. Thanks!

As Neil says, no, you won't lose anything unless there's a problem.
But you should always do a full backup before any upgrade; and you should do regular backups at all times. All hard drives fail, sooner or later. Other things break. Mistakes happen.
Get yourself an external HD or Time Capsule and start using Time Machine or another backup app regularly. When something breaks, you may lose all your data.
You might want to review these:
Time Machine Tutorial
Time Machine 101
How to back up and restore your files
Time Machine Features
Apple - Support - Mac OSX v10.5 Leopard Time Machine
and perhaps browse the Time Machine - Frequently Asked Questions *User Tip.*

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Using the "if you have never synched with itunes" instructions, will I lose all data on the phone? That is the most important information, how to recover the data. The phone is fungible.

Thanks @ KiltedTim, but losing "only" any data is really not acceptable and, in this case, the phone had not been backed up, but thanks for taking the time. Also, yes, fungible means what I think it means. An iphone is a completely substitutible commodity, unlike my data, so instructions that inform me as to how to fix a phone I could replace for a small sum of money while failing to address the more important issue of the data are almost useless - they potentially save me the $99 it would cost me to replace the phone if I were so inclined to trust another apple product. Not worth the hour it took to find them or the 35 minutes on the phone to confirm my suspicions about the data.

I changed my Apple ID but my iCloud didn't change to the new ID. If I delete the old iCloud will I lose all data on my iPod ?

I changed my Apple ID but my iCloud didn't change to the new ID. If I delete the old iCloud will I lose all data on my iPod ?

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Hi if I restore to factory settings will I lose all data and contacts?

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Hi, one of my daughters friends tried to access her ipod causing it to become disabled; i do not want her to lose all her photos, she accesses my itunes account which is on ICLOUD, will she lose all her data - can this be fixed? I do not think it has been synced with a computer before.

Disabled
If you previously synced to the computer then you may be able to recover use of the iPod without erasing the iPod by following the instructions here:
Disabled Recovery-must use syncing computer.
Otherwise y will have to restore and thus erase the iPod
You can restore from backup
If not in backup then:
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iOS: Importing personal photos and videos from iOS devices to your computer
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Wondershare Dr.Fone for iOS: iPhone Data Recovery - Wondershare Official
http://www.amacsoft.com/ipod-data-recovery.html
-iPod touch Deleted Photo Recovery Tips You Should Know
Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased.
iOS: Wrong passcode results in red disabled screen
If recovery mode does not work try DFU mode.
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
For how to restore:
iTunes: Restoring iOS software
To restore from backup see:
iOS: Back up and restore your iOS device with iCloud or iTunes
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You can redownload most iTunes purchases by:
Downloading past purchases from the App Store, iBookstore, and iTunes Store
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HT4818 hey, I want to install windows on my mac, I have mac osx lion and I'm soon going to get mountain lion. If I use Boot camp to install windows do I need a windows disc, will i lose all my data, etc. If so how to I save them. Can I switch back to osx

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Install iTunes.
Try using search next time... this gets asked way too frequently.

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http://support.apple.com/kb/ht1766

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No external; will I lose all data if I upgrade to SL?

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