Will changing encryption level result in a complete transfer

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griesioj8954jd
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Will changing encryption level result in a complete transfer

Post by griesioj8954jd » Thu Jul 12, 2018 6:40 am

Hi,

I am backing up to a network location using compression & encryption. Each file is back upped in a single zip file. So far I have set compression level to 0. I am now thinking about changing that to another level to save space. Does changing the compression level result in a complete transfer of all data or will Syncback only apply that change to files having modified after the change?

cliffhanger
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Re: Will changing encryption level result in a complete transfer

Post by cliffhanger » Thu Jul 12, 2018 11:48 am

Hi

I 'm assuming your Subject should read "Will changing compression level result in a complete transfer" (otherwise the Subject conflicts with your body text).

A quick test by changing the Compression level and then performing a Simulated Run (hint, hint :wink: ) should reveal that the profile will not want to re-compress/overwrite your old backups, because when using Destination resources (drives, network shares, etc) whose connection protocol* permits reading inside Zip files, the profile will do just that and will compare the LastModified and uncompressed Size parameters recorded in the Zip header of the file inside the Zip, which will still match the original file parameters, thus no ostensible reason to update the backup.

So, yes, you should find SyncBack will only re-create backups of files which have been modified after the change in Compression %

If you do want all files compressed at the new level (>0%), you would need to delete the current backup and re-run the profile with the new Compression settings.


* for example S/FTP protocols cannot read properties inside a Zip file. TBOMK standard networking protocols can, but I don't have the appropriate hardware at the moment to test that here, so I suggest you change the Compression setting, then do a Simulated run for yourself to make sure

griesioj8954jd
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Re: Will changing encryption level result in a complete transfer

Post by griesioj8954jd » Fri Jul 13, 2018 7:50 am

Thanks. Your correct. The title is incorrect. I will give it a try

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