There are no details yet on how the feature will show on Android — possibly alongside the uninstall option when you long-press an app’s icon. In either case, archived APKs appear to be ideal for anyone (particularly, me) who has a graveyard of rarely used apps and isn’t quite ready to let go (but also doesn’t want them to take up a tonne of storage space). Archiving and then restoring them should be significantly faster than reinstalling an app, and should consume significantly less mobile data when you’re not connected to Wi-Fi.
