What Apple Devices is. Apple Devices is Apple's app for managing an iPhone or iPad on Windows, installed from the Microsoft Store. It is the newer home for the device tasks iTunes used to handle, backups included, and it makes the same kind of local backup iTunes does.
What goes into its backup. When you choose to back up to this computer and select Back Up Now, the app copies the phone's data, including the Messages database, into a folder with a long coded name under %USERPROFILE%\Apple\MobileSync\Backup. Apple says a backup made on a computer leaves out iMessages and texts that already sync to iCloud, so with Messages in iCloud on, that database may hold few or no conversations. With Encrypt local backup on, the backup is protected by the password you set, and Apple says encrypted backups also hold saved passwords, Wi-Fi settings, website history, health data and call history.
What it does not do. Apple Devices has no viewer for backups. It does not list conversations, search messages, or save a thread as a PDF, a spreadsheet or any other file. What it can do with an existing backup is restore it onto an iPhone, which replaces what is on that phone.
Where BackupPaper fits. BackupPaper reads the folder Apple Devices wrote, without changing it. Choose the backup folder, type the password if the backup is encrypted, and the conversations appear with message counts and last dates. Pick one and choose Export PDF or Export CSV; each export is a new file you name, and BackupPaper refuses to save it inside the backup folder. Apple Devices keeps working as before.
A routine that works. Back up in Apple Devices whenever you want a fresh copy of the phone. Then open BackupPaper, which reopens the last backup you used, and export the conversations you want to keep as files. Because those exports live outside the backup folder, they stay put when Apple Devices updates or replaces that backup later.
Limits to keep in mind. BackupPaper reads the Messages app only, iMessage and SMS. It lists attachments by name without saving photos or videos, and it exports one conversation per file. It does not read the phone directly, iCloud backups or Messages in iCloud, and it cannot recover or reset a backup password. It runs on Windows 10 version 2004 or later and on Windows 11.