Yes. They can always be restored from the backup.
One major improvement that was made in Windows 7 was the ability to free up space quicker. Disc Utility has evolved to delete files while backing up files.
third party
push delete push delete
You can find the device on your computer, go into it, and check if your files are there. If they are, it is backing up your stuff.
By backing up Manually one would have to do it yourself correctly every time "by hand", while automatically you insert your desired settings into Windows or another backup software to do it for you for as long as you want.
"Backing up files is not a new phenomenon to Windows 7. Backing up your files enable you to keep a record of all your important files and information in case your computer crashes, gets a virus, is stolen or any other unfortunate incident."
Yes, it does. If the system crashes, you do not have to recreate all the files.
no
No, rebooting does not delete your files.
If you don't mind losing all of your files then yes, it is ok.
It means it's backing up all of your songs , apps and photos while syncing.. That why if you delete anything you'll have all of your data on iTunes
You can not delete files or records from your backup or log files. This would defeat the purpose of having a solid, accountable record history.