How to back up JW Library the right way
A 30-second backup routine: what a .jwlibrary file actually holds, where to keep it, and why a current one is worth having even when nothing has gone wrong.
A backup takes about half a minute, and it is worth making a habit of — though not quite for the reason people usually give. JW Library's own Backup and Restore already moves a library to a new device perfectly well, so a backup is less an insurance policy than the raw material for everything else you might want to do with your study.
A .jwlibrary file is the only form your library takes outside the app. It is what you merge when two devices have both been studied on, what you open to read, retag or reorganise years of notes, what you search by meaning when you can only half remember what you wrote, and what you draw a set of notes from when you want to send some to a friend. Keeping a current one is what makes any of that available.
Step by step
Create the backup
Open JW Library → Personal Study → three-dot menu → Backup and Restore → Create a backup. It produces a .jwlibrary file containing every note, highlight, bookmark and tag.
Store it somewhere off the phone
Email it to yourself, or save it to Google Drive, iCloud or OneDrive. A backup that only lives on the phone disappears with the phone.
Repeat on a schedule
Monthly is a good default; before any phone change, reset or OS update is essential. Keep older copies — the files are small, and an old backup has saved many people.
The common mistake: trusting the phone's own cloud backup
A whole-phone backup (Google One, iCloud device backup) often restores an old copy of JW Library's data — or none at all. The .jwlibrary file is the only backup you fully control and can carry between platforms. Treat the phone backup as a bonus, not the plan.
Ended up with two different backups?
It happens: one backup from the phone, an older one from a tablet, each with unique notes. You never have to choose between them — merge them into one complete file at jwsync.org, free and private, right in the browser.
What the file contains, and what it does not
The backup holds your personal study data: notes, highlights and their colours, bookmarks, tags, and the answers you have typed into study-question fields. It does not hold the publications themselves — no Bibles, magazines, books, videos or audio. That is why a backup of years of study is usually only a few megabytes, and why restoring on a new device leaves you re-downloading publications while every note you wrote is already back in place.
How many backups to keep
Keep more than one. The failure that costs people their notes is rarely a lost file — it is a good backup overwritten by a bad one, or a restore performed on the wrong device. Because the files are small, there is no reason to delete old ones: keep them dated in a folder in cloud storage. A backup from six months ago is not worthless even after you have newer ones, because anything you deleted by accident since then still exists inside it.
Where to store them
Anywhere that is not only the device itself. A folder in Drive, iCloud, Dropbox or OneDrive covers the case that matters most — the device being lost, stolen, reset or damaged. Emailing the file to yourself works too and has the useful side effect of date-stamping it. The file contains your own study notes, so treat it with the same care you would any personal document.
Verifying a backup before you rely on it
A backup you have never opened is an assumption, not a safety net. You can open a .jwlibrary file in your browser and see exactly which notes, highlights and bookmarks it contains — a thirty-second check that turns an assumption into a fact. This matters most immediately before something irreversible: a factory reset, a trade-in, a repair, or a major OS upgrade.
The moments worth backing up before
Any point where the device changes hands or state: an OS upgrade, a factory reset, a repair or screen replacement, a trade-in, or handing a device on to someone else. Add to that the end of anything you would hate to redo — a convention, an assembly, a stretch of preparation for a talk. Backups are cheap and quick, so the useful habit is tying them to events rather than to a calendar.
A phone backup is not a JW Library backup
Google One, an iCloud device backup or a manufacturer transfer tool operate at the device level and treat app-private data inconsistently. People routinely find that a full phone restore brought back their apps and settings but not their study notes, or brought back a version from weeks earlier. The .jwlibrary file is the only copy whose contents you control and can verify, so treat the phone-level backup as a bonus rather than the plan.
Turning it into a habit that survives
The routine that actually holds is the one attached to something you already do: back up when you finish preparing for the week, or on the same day you do any other regular admin. Save to the same folder every time so the files accumulate in one place, and leave the old ones there. A folder of dated backups going back years is the most robust form this can take, and it takes seconds a week to maintain.
Frequently asked questions
- How big is a backup file?
- Usually a few megabytes even for very large libraries — email-attachment small.
- Does creating a backup change anything on my phone?
- No. It only writes the file; your library is untouched.
- Does the backup include my downloaded publications?
- No. Only personal study data. Publications are re-downloaded on the new device, and your notes reattach to them automatically.
- Can I open a backup to check what is in it?
- Yes. You can open a .jwlibrary file in your browser and browse every note, highlight and bookmark it holds, without installing anything and without the file leaving your device.
- Do backups expire?
- No. A .jwlibrary file stays restorable indefinitely. Restore into a current version of JW Library rather than an old one, since the app reads older backup formats but not newer ones.
- Should I back up before every meeting?
- No need. Tie backups to events that could cost you data — updates, repairs, new devices — plus a regular rhythm that matches how much study you would mind repeating.
- Is it worth keeping backups from years ago?
- Yes. They are small, and anything you deleted by accident since then still exists inside them.