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outdoorbits / little-backup-box

This software turns a single-board computer into a versatile, pocket-sized backup solution. Especially for digital photography, this is the solution for backing up images and media files on mass storage devices when traveling or at events. Media content can be viewed and rated for the subsequent process.
http://littlebackupbox.com
GNU General Public License v3.0
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Not unique media id #27

Closed abertelmann closed 6 years ago

abertelmann commented 6 years ago

Hello. I came on an issue with identical media ids yesterday when i tried to prepare 3 sd cards in a row.

Preparing for a trip i wanted to prepare the (empty, freshly formated by camera) sd cards and the backup usb stick. I followed the usual way - power up Pi, insert usb backup medium, insert sd card (with usb card reader), wait for shutdown (some 30 seconds). Repeat 3 times in about 3-5 minutes.

When checking the usb stick on another machine i found only 2 backup folders. I checked the sd cards as well and found 2 with identical id file name.

I solved the problem by deleting one card's id file and repeating the setup, about 10 minutes after the first try. I ended OK with a new id there.

I think it may be a problem when preparing more than one media in short time, on a Pi without correct system time (headless Pi zero in my case, no network connection).

This may lead to loss of data when backing up 2 different cards with identical id onto the same backup medium.

My cards where of 2 different types, the identical ids were on the cards of the same type - any issue there (i did not study the script)?

I just updated little-backup-box to the actual version (as headless backup device) after using the old version for about 8 or 10 months. I did not have any trouble there, maybe because it used random id number or i did not prepare multiple cards in a row.

Maybe you should revert to the old system, or (since a date-time based system has some advantages for book-keeping) to a combined system.

As for your work - i really like your little helpers and your ebook - highly recommended!

Greets Andreas

dmpop commented 6 years ago

Hi Andreas,

Thank you for reporting the issue! You are right: if the system time is not set, this can cause problems with generating unique ids. I'll work on a fix.

dmpop commented 6 years ago

Fixed in 162719bd64d6f6430e4d52f6288c7b8598fcf591 I'd be grateful if you could test it.

abertelmann commented 6 years ago

Works! Thanks for the instant fix

Andreas