Sync is not the same as backup
Sync keeps your data mirrored live across signed-in devices, but it is not a substitute for a true backup in every sense β for example, deleting a bookmark on one device deletes it everywhere it syncs to, rather than preserving a separate copy elsewhere.
Passwords sync securely, not visibly
Synced passwords are encrypted, and Google generally cannot read their plaintext content. You can also set an additional local sync passphrase for extra protection, though this makes the synced data unrecoverable if you ever forget that passphrase.
Frequently Asked Questions
Can I sync between a work Chrome profile and a personal one?
Not directly β Chrome profiles are designed to stay separate by account, which is intentional so work and personal bookmarks, passwords, and history do not mix. You would sign into each profile with its own Google account instead.
Does turning off sync delete data already synced to other devices?
No. Turning off sync on one device just stops that device from sending or receiving further updates; data already synced to your other devices, and stored in your Google account, remains untouched.