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Data backup to SD Card

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I am trying to find a practical solution to backup a small amount of document/email data to a 32GB SD card fitted in my laptop at times when external disk drives or the network is unavailable e.g when travelling.
Generally the backup would be about 15GB in total.
The problem is if I set up an incremental backup with a cleanup parameter of 1 old version there isn't enough space to create the new version before Acronis deletes the old version.
I've tried using incremental with no cleanup parameter along with a "notification" to flag when the SDCard is within 4GB then I manually delete the backups but that seems to confuse TI2013 since it still expects to see those incremental backups still there and of course they have been deleted.
Can anyone think of another approach short of doing 1 full backup every time ( which I suspect would also fail if the full backup became more than 16GB i.e. half the capacity of the card )
Thanks

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I think your only option is to get a larger card. Unhelpful I know, you could try making a differential instead of incremental, the diff file will be smaller and you could combine this with a file size consolidation parameter, though file sized based tasks sometimes cause problems.

You could create a command line batch file to delete any existing backup before the new backup starts.

Thanks for the reply - yes that sounds an interesting approach.
I presume you mean write a DOS batch file and call it up in this Pre Command.
I've looked at the help on Pre/Post Command but it's really not very helpful.
Is there somewhere I can see a list of typical commands so I can get the syntax right ?

Just write your batch file. Test it to make sure it works as expected. In the backup options, check custom commands. In the command box, browse to your batch file. The working directory will auto populate, leave the 2 check boxes checked.

Thanks for the info - yes that works fine. Just a few adjustments to the batch file to stop the need for keyboard intervention and that will be a good solution.