# why last backup's to\_lsn?

**URL:** <https://forums.percona.com/t/why-last-backups-to-lsn/5685>\
**Category:** Percona XtraBackup\
**Created:** [June 16, 2017, 4:01am UTC](https://forums.percona.com/t/why-last-backups-to-lsn/5685 "2017-06-16T04:01:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![aaron1989041](https://avatars.discourse-cdn.com/v4/letter/a/ee59a6/32.png) [@aaron1989041](https://forums.percona.com/u/aaron1989041)\
**Post date:** [June 16, 2017, 4:01am UTC](https://forums.percona.com/t/why-last-backups-to-lsn/5685/1 "2017-06-16T04:01:18Z")

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why incremental\_backup backup those pages from last backup’s to\_lsn?is this mandatory?why not last\_lsn?