Where Does the Postbank App Store Data?
The Postbank app keeps login session and cached mailbox documents in private storage on Android and iOS, with accounts restored after login.
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Postbank runs one shared ID on both mobile OSes. Private databases hold the login session and mailbox cache. Device binding stays local too. Accounts and letters sync from servers after login, so local files hold tokens and cached PDFs rather than the account itself. That split matters for reinstalls. The binding is what approves transfers.
iOS adds a per install GUID, so the container path changes with every install. Treat reinstalls as new devices for TAN. Keep a second TAN method ready before wiping the old phone. Folder copies miss the encrypted stores and never transfer the binding. Export statements as PDF from inside the app before wiping.
Where Postbank stores this, by platform
/data/data/de.postbank.banking
Private session and mailbox cache for the verified Postbank package. BestSign binding is device bound; copying never transfers it.
/var/mobile/Containers/Data/Application/<guid>/Documents
GUID container for the same bundle (App Store ID 6444706327). Re register BestSign after restore.
Frequently asked questions
Do Postbank accounts survive reinstall?
No. Accounts and letters sync from Postbank servers after login. Local data holds tokens and cached PDFs. Reinstall and sign back in, then check the mailbox for letters. Device binding stays local, so folder copies do not carry the session.
How do I back up Postbank statements?
Export statements as PDF from inside the app before wiping. Manual folder copies miss encrypted stores and break BestSign binding. Re register BestSign after restore.
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