When you first sign in to iCloud, iCloud Backup turns on automatically. iCloud backs up iPod touch daily over Wi-Fi, when it’s connected to a power source and is locked. (To lock iPod touch, press the Sleep/Wake button. iPod touch also locks automatically if you don’t touch the screen for a minute or so.)
iCloud backups are encrypted automatically so that your data is protected from unauthorized access both while it’s transmitted to your devices and when it’s stored in iCloud. Purchased content, iCloud Photo Sharing, and My Photo Stream content don’t count against your 5 GB of free iCloud storage.
Music that wasn’t purchased in iTunes isn’t backed up in iCloud, but it can be restored by syncing with iTunes on your computer. See Sync with iTunes.
When you back up using iCloud, you can’t simultaneously use iTunes to automatically back up iPod touch to your computer. However, you can use iTunes to manually back up iPod touch to your computer. See Back up iPod touch with iTunes.
iCloud backups don’t include:
Data that’s already stored in iCloud, such as contacts, calendars, notes, iCloud Shared Streams, My Photo Stream, iCloud Photo Library, and the contents of iCloud Drive
Data stored in other cloud services, such as Gmail and Exchange mail
Content you didn’t get directly from the iTunes Store, App Store, or iBooks Store, such as imported MP3s, videos, or CDs
Content from the iTunes Store, App Store, or iBooks Store (if it’s still available, you can tap to redownload content you purchased)
Stop or resume iCloud backups. Go to Settings > [your name] > iCloud, then turn iCloud Backup off or on.
Back up immediately on iCloud. Go to Settings > [your name] > iCloud > iCloud Backup, then tap Back Up Now.
View or remove iCloud backups. Go to Settings > [your name] > iCloud > iCloud Storage > Manage Storage.
Important: Backups for music, movies, or TV show purchases aren’t available in all countries. Previous purchases may not be restored from iCloud Backup if they're no longer in the iTunes Store, App Store, or iBooks Store.
If you replace your iPod touch, you can use its backup to transfer your information to a new device. See Restore or reset using iTunes.
For more information, see the Apple Support article About backups for iOS devices.