# Sync to rekordbox has lost my library

**URL:** <https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874>\
**Category:** Questions & Help\
**Created:** [October 4, 2022, 8:20pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874 "2022-10-04T20:20:31Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Duncan](https://discuss.lexicondj.com/letter_avatar_proxy/v4/letter/d/ecc23a/32.png) [@Duncan](https://discuss.lexicondj.com/u/Duncan)\
**Post date:** [October 4, 2022, 8:20pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/1 "2022-10-04T20:20:31Z")

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Hi there, I have just used lexicon for the first time and tried playing with a folder on my rekordbox - then I went to sync and I pressed full and now I have lost all 50k and replaced it 154 tracks I was reviewing - can I reserve this ??

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**Author:** ![Christiaan](https://discuss.lexicondj.com/user_avatar/discuss.lexicondj.com/christiaan/32/10_2.png) [@Christiaan](https://discuss.lexicondj.com/u/Christiaan)\
**Post date:** [October 4, 2022, 9:03pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/2 "2022-10-04T21:03:47Z")

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Check out [Backups and how to restore them](https://discuss.lexicondj.com/t/backups-and-how-to-restore-them/766)

Be sure to only run Sync when you want your RB library to be the same as Lexicon. That’s why you start with a full import

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**Author:** ![Duncan](https://discuss.lexicondj.com/letter_avatar_proxy/v4/letter/d/ecc23a/32.png) [@Duncan](https://discuss.lexicondj.com/u/Duncan)\
**Post date:** [October 7, 2022, 10:44pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/3 "2022-10-07T22:44:21Z")

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I have found the master.db file - do I copy it and paste it where ?  
You mention replace in the rekordbox folder but which one actual folder and where do I find it and how do I get ret it to run again ?  
basically I am struggling with the part that quotes  
“replace the `master.db` file in the `rekordbox` folder.”  
Thanks

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**Author:** ![Christiaan](https://discuss.lexicondj.com/user_avatar/discuss.lexicondj.com/christiaan/32/10_2.png) [@Christiaan](https://discuss.lexicondj.com/u/Christiaan)\
**Post date:** [October 8, 2022, 7:46am UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/4 "2022-10-08T07:46:01Z")

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Above the folder where you found the backup zip file, it is a folder called `rekordbox`. Inside there is a file called `master.db`, that is your current RB database and if you replace that with the one from the zip file, you will restore the backup.

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**Author:** ![Duncan](https://discuss.lexicondj.com/letter_avatar_proxy/v4/letter/d/ecc23a/32.png) [@Duncan](https://discuss.lexicondj.com/u/Duncan)\
**Post date:** [October 11, 2022, 12:37pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/5 "2022-10-11T12:37:20Z")

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Basically RB cannot restore using your master db file which Lexicon created - as it does not contain any of content that RB needs to restore my library

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**Author:** ![Christiaan](https://discuss.lexicondj.com/user_avatar/discuss.lexicondj.com/christiaan/32/10_2.png) [@Christiaan](https://discuss.lexicondj.com/u/Christiaan)\
**Post date:** [October 11, 2022, 5:36pm UTC](https://discuss.lexicondj.com/t/sync-to-rekordbox-has-lost-my-library/874/6 "2022-10-11T17:36:48Z")

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You don’t need to do anything inside RB, all you have to do is replace the master.db file and then it is done.