How do I install a new app from my PC w/out sync'g other apps on my Touch?

Question

Problem: How do I manually control what gets sync'd from PC to iPod Touch?
Bkgrnd: I do NOT autosync becuz I have a lot of music files on the iPod that aren't on this computer and I don't want the music overwritten by the empty PC music library.
Detail: I downloaded an app to iTunes Library on my PC and it shows up on the Apps Tab in the iPod Touch Device Folder. The "Apps" tab screen is divided into 2 areas: on the left is a gray'd out section with the words *"Sync Apps"* at the top along with and an UNCHECKED box. The new app is listed below that with another box that is UNCHECKED. The area to the right shows all the current apps are mail and note apps with data I don't want to lose.
When I click the *"Sync Apps"* I get a warning: *_"+Are u sure you want to sync apps? All existing app and their data on the iPod Touch will be replaced with apps from this iTunes Library."_*+ I'm afraid if I click "Sync Apps" that I'll lose my music. Soooo... how do I control what gets sync'd? Is there a way to back up my music on to this PC just to make sure I won't lose it?

Answer 1

You can, and should, back up your data to your PC.
1)Connect your ipod, select it, and right click. Select Transfer Purchases. This will transfer over any Apps or Music you purchased from the iTunes store.
2)Also, while right clicked, select Back up. You will want this back up when you sync your ipod with your new computer so you can restore from your backup. See [About Backups|http://support.apple.com/kb/HT1766] to learn what's included in a backup, but note that it does not include the items in step 2. Note: *Any music not purchased from the iTunes store will not be backed up* It is assumed that since you were able to sync and put this on your ipod, it resides on your computer already. Again, check the link above to see what is backed up.
3)To sync, select your device in iTunes. If you want to exclude music from you sync, on the Summary tab check Manually manage music and videos under Options. The go to the Apps tab and select the Apps you want to sync.
If you have never sync'd with this computer before it will warn you that it's going to wipe out your data. That's because an ipod can only be synced to one library. No way around that. It sounds like that's what's happening.
If you have all the iTune store purchases made on your touch transferred to your computer (step 1), your ipod backed up (step 2) and all other data such as music from CD's, photos, etc in your iTunes library you should be fine. It will want to remove your data to sync with this library but you can [restore from the backup|http://support.apple.com/kb/HT1414] (see link for more info on how) you made in step 2 and then sync your music etc after that. But if this is the last computer you've sync'd with you shouldn't have to do that.
Hope that helps.