# Two comparable backups, huge duration differences
**URL:** https://forum.duplicati.com/t/two-comparable-backups-huge-duration-differences/5366
**Category:** Support
**Created:** [November 21, 2018, 4:16pm UTC](https://forum.duplicati.com/t/two-comparable-backups-huge-duration-differences/5366 "2018-11-21T16:16:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@anon8404338](https://forum.duplicati.com/u/anon8404338)
#### Post date: [November 21, 2018, 4:16pm UTC](https://forum.duplicati.com/t/two-comparable-backups-huge-duration-differences/5366/1 "2018-11-21T16:16:09Z")
I have two family members backing up to my systems where I am running minio. This works. Both are still running older Macs. But one of these is very slow (30min-1 hour, both remotely to me (210GB) and locally (40GB) on a local hard disk) and the other is pretty quick (220GB remotely). The slow one even has a better internet connection. The only difference I can see is that the quick one has a lot more ‘changed data’ (I’m using [duplicati-monitoring.com](http://duplicati-monitoring.com)) that the other (250MB-500MB versus 5MB. So, I need to find out what part if the backup is causing these amounts of changed data.
What is the best way to find out what part of a backup is ‘changed data’? Some specific level of verbosity I can set to get to the bottom of this?
---
### Author:  [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [November 22, 2018, 2:11am UTC](https://forum.duplicati.com/t/two-comparable-backups-huge-duration-differences/5366/2 "2018-11-22T02:11:20Z")
> [@anon8404338](#):
>
> the quick one has a lot more ‘changed data’
Did you mean to say the **slow** one has a lot more? Regardless, I think there’s no verbosity that gives per-file information on changed data, however there is a way to see what files are being added, deleted, or changed.
[The COMPARE command](https://duplicati.readthedocs.io/en/latest/04-using-duplicati-from-the-command-line/#the-compare-command)
Sample output:
```
Listing changes
1: 11/20/2018 8:41:59 AM
0: 11/21/2018 10:02:18 AM
Size of backup 1: 343.77 MB
1 added entries:
+ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\bookmarkbackups\bookmarks-2018-11-21_1422_1kdKfrSWi29YPJOva1+VJg==.jsonlz4
5 modified entries:
~ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\bookmarkbackups\
~ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\sessionstore-backups\
~ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\sessionstore-backups\previous.jsonlz4
~ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\sessionstore-backups\recovery.baklz4
~ C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\sessionstore-backups\recovery.jsonlz4
1 deleted entries:
- C:\Users\Ted\AppData\Roaming\Mozilla\Firefox\Profiles\rsbrp398.default-1528892271354\bookmarkbackups\bookmarks-2018-11-20_1422_1kdKfrSWi29YPJOva1+VJg==.jsonlz4
Added files: 1
Deleted files: 1
Modified folders: 2
Modified files: 3
Size of backup 0: 343.67 MB
```
and then you must guess which files were the offenders in making a big upload. Note that the [backup](https://duplicati.readthedocs.io/en/latest/01-introduction/#the-backup-process-explained) is on a file-block basis, and only changed blocks are uploaded. Unchanged blocks from old backups are referenced.
EDIT: A nicer web-UI-Commandline version from @kees-z (thanks!) of running a `compare` just went up [here](https://forum.duplicati.com/t/feature-request-list-all-backup-sets-with-their-size/5257/6), for someone wanting basically the same thing (or at least giving them something that comes kind of close…).
---
### Author:  [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [November 27, 2018, 9:26pm UTC](https://forum.duplicati.com/t/two-comparable-backups-huge-duration-differences/5366/3 "2018-11-27T21:26:48Z")
> [@ts678](#):
>
> I think there’s no verbosity that gives per-file information on changed data
Sounds like an opportunity for a pretty “changes per file / folder” (both absolute and size percentage) type chart or graph. 😃