Google Play Services version 26.26 has introduced a new backup feature for Android users that automatically backs up documents in various formats (.DOC, .PPT, .XLS, .PDF) from devices to Google Drive. This feature can be activated through Settings > Accounts and backup > Google Backup settings, where a new Documents category will appear. Backed-up documents will be stored in a folder named Android backups within Google Drive, but users should monitor their storage space as this will utilize their cloud storage. Alternative backup methods include using manufacturer-specific features or third-party apps like Syncthing.