# Does Upgrading/Downgrading Affect Backup Files? **URL:** https://forum.duplicati.com/t/does-upgrading-downgrading-affect-backup-files/5450 **Category:** Uncategorized **Created:** [November 29, 2018, 10:34am UTC](https://forum.duplicati.com/t/does-upgrading-downgrading-affect-backup-files/5450 "2018-11-29T10:34:38Z") **Posts on this page:** 1 **Showing post:** 7
### Author: ![darkarn](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/d/5f8ce5/32.png) [@darkarn](https://forum.duplicati.com/u/darkarn) #### Post date: [December 7, 2018, 5:07am UTC](https://forum.duplicati.com/t/does-upgrading-downgrading-affect-backup-files/5450/7 "2018-12-07T05:07:13Z")
> [@JonMikelV](#): > > Oh, and I didn’t mention it before but the slow initial backup you’re seeing will likely speed up a lot after that initial run is complete. So you may want to let the initial backup finish as planned, but then do at least 1 subsequent run on 2.0.3.3 just to get an idea of pre-upgrade performance on a backup with at least 1 version completed. I have just finished the second round of backups under 2.0.3.3. Here’s the rough stats: Initial Backup of 3.7 TB: 15 days 11 hours Scan of this dataset (no data change): 50 mins 2nd Round of additional 900 GB (on top of the 3.7 TB): 4 days 20 hours Scan of this dataset (no data change): 52 mins I’ll continue this over at the other thread ([Duplicati 2.0.4.5\_beta much slower than 2.0.3.3\_beta - #4 by warwickmm](https://forum.duplicati.com/t/duplicati-2-0-4-5-beta-much-slower-than-2-0-3-3-beta/5536/4)) --- _[View the full topic](https://forum.duplicati.com/t/does-upgrading-downgrading-affect-backup-files/5450)._